How does valency of an element vary across a period?

How does valency of an element vary across a period?
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How does valency of an element vary across a period?
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Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period?

Description : Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period?

Last Answer : Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period?

How the atomic size vary in a group and across a period? Explain with suitable example.

Description : How the atomic size vary in a group and across a period? Explain with suitable example.

Last Answer : How the atomic size vary in a group and across a period? Explain with suitable example.

How does electro positivity and electro negativity vary across a period and down a group?

Description : How does electro positivity and electro negativity vary across a period and down a group?

Last Answer : Electro positivity decreases along a period and increases down the group. Electro negativity increases a period and decreases down the group. Electro positivity

How does ionisation energy vary across a period and down a group?

Description : How does ionisation energy vary across a period and down a group?

Last Answer : Ionisation energy increases along a period and decreases down a group. Ionisation energy decreases with increase in the atomic size. Ionisation energy Increases Across a period (Left to right)

An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science

Description : An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science

Last Answer : Mass number = 4 Atomic number = 2 X is Helium. It has 0 valency and it will not react with any other atom because it has its outer shell filled.

An atom has atomic number 12, what is its valency and name the element? -Chemistry 9th

Description : An atom has atomic number 12, what is its valency and name the element? -Chemistry 9th

Last Answer : Element with atomic number 12 is Magnesium (Mg). Electronic configuration of magnesium is 1s2 2s2 2p6 3s2. It has 2 e- in its outermost orbit and can donate these to form a stable octet. Hence, its valency is +2.

Why the valency of an element is a whole number?

Description : Why the valency of an element is a whole number?

Last Answer : Because there is no such thing as a fraction of an electron.

How does electro negativity vary down the group 17 and why? How does it vary from left to right in the period? Name an element having highest electro negativity.

Description : How does electro negativity vary down the group 17 and why? How does it vary from left to right in the period? Name an element having highest electro negativity.

Last Answer : Ans. Electro negativity decreases down the group due to increase in atomic size. It increases along the period from left to right due to decrease in atomic size. Fluorine (F) has highest electro negativity.

Which of these will likely vary most across different cultural contexts?

Description : Which of these will likely vary most across different cultural contexts?

Last Answer : Celebrating a wedding

For steady ideal fluid flow, the Bernoulli's equation states that the (A) Velocity is constant along a stream line (B) Energy is constant throughout the fluid (C) Energy is constant along a stream line, but may vary across stream lines (D) None of these

Description : For steady ideal fluid flow, the Bernoulli's equation states that the (A) Velocity is constant along a stream line (B) Energy is constant throughout the fluid (C) Energy is constant along a stream line, but may vary across stream lines (D) None of these

Last Answer : (C) Energy is constant along a stream line, but may vary across stream lines

According to Bernoulli's equation for steady ideal fluid flow (A) Principle of conservation of mass holds (B) Velocity and pressure are inversely proportional (C) Total energy is constant throughout (D) The energy is constant along a streamline but may vary across streamlines

Description : According to Bernoulli's equation for steady ideal fluid flow (A) Principle of conservation of mass holds (B) Velocity and pressure are inversely proportional (C) Total energy is constant throughout (D) The energy is constant along a streamline but may vary across streamlines

Last Answer : Answer: Option D

When a radioisotope undergoes beta minus decay, does its atomic number: w) increase x) decrease y) remain the same z) vary depending on the element involved

Description : When a radioisotope undergoes beta minus decay, does its atomic number: w) increase x) decrease y) remain the same z) vary depending on the element involved

Last Answer : ANSWER: W -- INCREASE

Why do Helium, Neon and Argon have a zero valency? -Science

Description : Why do Helium, Neon and Argon have a zero valency? -Science

Last Answer : Helium has 2 electrons in its outermost orbit thus filling shell 1 and forming duplet configuration in the valence shell. Neon has 8 electrons in their valence orbit hence completing duplet ... reach stable electron configuration and they will not take part in any sort of chemical reactions.

The valency of silicon is -Science

Description : The valency of silicon is -Science

Last Answer : According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or lose 4 electrons because it is a noble gas. Hence valency of silicon is 4

Difference between Valency and Valence electrons ? -Chemistry

Description : Difference between Valency and Valence electrons ? -Chemistry

Last Answer : 1 ) Valency : The ability to gain, loose and sharing of electrons is valency / combinig capacity atoms of other elements is valency. 2 ) Valence elctrons : Electrons present in the outermost shell of the atom is valence electrons.

Define the term valency. What is the valency for magnesium and copper? -Chemistry 9th

Description : Define the term valency. What is the valency for magnesium and copper? -Chemistry 9th

Last Answer : The no.of electrons required for the element to be octate or duplate is known as valency. Magnesium = 2 Copper = 1 hope this helps u

If a metal X with valency 3 combines with a non-metal Y with a valency 2, what will be the formula of the compound formed when X and Y combines?

Description : If a metal X with valency 3 combines with a non-metal Y with a valency 2, what will be the formula of the compound formed when X and Y combines?

Last Answer : 1

Find the valency factor for following bases : `(i) Ca(OH)_(2) " " (ii) CsOH " " (iii) Al(OH)_(3)`

Description : Find the valency factor for following bases : `(i) Ca(OH)_(2) " " (ii) CsOH " " (iii) Al(OH)_(3)`

Last Answer : Find the valency factor for following bases : `(i) Ca(OH)_(2) " " (ii) CsOH " " (iii) Al(OH)_(3)`

Find the the valency factor for following acids `(i) CH_(3)CO OH " " (ii) NaH_(2)PO_(4) " " (iii) H_(3)BO_(3)`

Description : Find the the valency factor for following acids `(i) CH_(3)CO OH " " (ii) NaH_(2)PO_(4) " " (iii) H_(3)BO_(3)`

Last Answer : Find the the valency factor for following acids `(i) CH_(3)CO OH " " (ii) NaH_(2)PO_(4) " " (iii) H_(3)BO_(3)`

Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

Description : Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

Last Answer : Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

The valency is zero for

Description : The valency is zero for

Last Answer : The valency is zero for A. Neon B. Fluorine C. Oxygen D. Carbon

What is the name of the family of reactive metals having valency two?

Description : What is the name of the family of reactive metals having valency two?

Last Answer : What is the name of the family of reactive metals having valency two?

What is the name of the family of reactive metals having valency one?

Description : What is the name of the family of reactive metals having valency one?

Last Answer : What is the name of the family of reactive metals having valency one?

What the valency of bicarbonate is?

Description : What the valency of bicarbonate is?

Last Answer : The charge of ion bicarbonate, HCO3 (not valency) is -1.

What is the valency of fluorine in calcium fluoride?

Description : What is the valency of fluorine in calcium fluoride?

Last Answer : 1. This is answerI have another question to ask youWhat is the valency of calcium in calcium flouridePlease can you answer to my question

Tyrosine of thyroglobulin is acted upon by ________ to give mono and diiodo tyrosines. (A) Potassium Iodide (B) Iodine (C) Iodide I (D) Higher valency state of iodine (I+)

Description : Tyrosine of thyroglobulin is acted upon by ________ to give mono and diiodo tyrosines. (A) Potassium Iodide (B) Iodine (C) Iodide I (D) Higher valency state of iodine (I+)

Last Answer : Answer : D

The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration

Description : The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration

Last Answer : Ans:(d)

The valency of carbon is

Description : The valency of carbon is

Last Answer : four.

Why do inert gases have zero valency?

Description : Why do inert gases have zero valency?

Last Answer : Inert gases have zero valency because their octet is complete.

Define: (a) Radical (b) Valency (c) Molecular formula

Description : Define: (a) Radical (b) Valency (c) Molecular formula

Last Answer : (a) Radical: A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.  (b) Valency: It is the ... number of atoms of each element present in it. These atoms combine in whole number to form the molecule. 

The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Description : The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Last Answer : C) Widely differing electronegativity

Why chlorine is electronegative? What type of valency it will show with hydrogen.

Description : Why chlorine is electronegative? What type of valency it will show with hydrogen.  

Last Answer : Chlorine gains one electron from another atom so as to complete its octet therefore chlorine is electronegative.  Type of valency with hydrogen : Co-valency.  

Define valency. Write their types.

Description : Define valency. Write their types.

Last Answer : Valency:- The number of electrons donated (lose) or accepted (gain) or shared by atom of an element in order to complete its octet & attain stability is called as Valency.  Types of Valency : 1. Electro valency 2. Co valency 3. Co-ordinate valency

Define: i) Valency ii) Valence electrons.

Description : Define: i) Valency ii) Valence electrons. 

Last Answer : Valency:- The number of electrons donated (lose) or accepted (gain) or shared by atom of an element in order to complete its octet & attain stability is called as Valency.  Valence electrons: ... in the outermost orbit of an atom determine the valency of an atom and hence called valence electrons. 

(a) What are ‘groups’ and ‘periods’ in the ‘periodic table’? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary? Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.

How does metallic nature vary along a period and down a group?

Description : How does metallic nature vary along a period and down a group?

Last Answer : Metallic nature decreases along a period and increases down the group. Example: In the 14 th group there are elements carbon, silicon, germanium, tin and lead. Carbon and silicon are non-metals, tin and leads are metals.

During secular variation of magnetic meridian at different places (A) Range of oscillations is constant (B) Period of oscillation is constant (C) Range and period of oscillation both vary (D) Period of oscillation only varies

Description : During secular variation of magnetic meridian at different places (A) Range of oscillations is constant (B) Period of oscillation is constant (C) Range and period of oscillation both vary (D) Period of oscillation only varies

Last Answer : (C) Range and period of oscillation both vary

The electron beam in a CRT is made to sweep from left to right across the screen. What tube element causes this sweeping motion?

Description : The electron beam in a CRT is made to sweep from left to right across the screen. What tube element causes this sweeping motion?

Last Answer : The horizontal-deflection plate.

a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.

What is the term for the period when many western traveled across the Atlantic and Pacific oceans for the first time?

Description : What is the term for the period when many western traveled across the Atlantic and Pacific oceans for the first time?

Last Answer : Age of Exploration

What is is the trend across a period?

Description : What is is the trend across a period?

Last Answer : what is the reason for ionization energy across a period

What is a general trend in ionization energy across a period?

Description : What is a general trend in ionization energy across a period?

Last Answer : Need answer

Atomic radius _moving from left to right across a period?

Description : Atomic radius _moving from left to right across a period?

Last Answer : Decreases

In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).

Autotransformer starters or compensators are sometimes used with polyphase induction motors to _____________. A. reduce the voltage applied to the motor during the starting period B. increase the voltage for 'across-the-line starting' C. provide a backup means of voltage regulation for emergency starting D. allow the voltage to be either stepped up or down, depending on the application, to ensure full torque

Description : Autotransformer starters or compensators are sometimes used with polyphase induction motors to _____________. A. reduce the voltage applied to the motor during the starting period B. increase the voltage for ' ... to be either stepped up or down, depending on the application, to ensure full torque

Last Answer : Answer: A

Why does atomic size (radius) decrease across a period?

Description : Why does atomic size (radius) decrease across a period?

Last Answer : The atomic radius decreases along a period because the atomic number increases by one, but the additional electron goes to the same shell.There is no change in the number of shells but more ... in closer to the nucleus which leads to contraction of the atom and thus decrease in atomic size

In general, as you move across a period (left to right) electronegativity: w) increases x) decreases y) remains the same z) increases or decreases

Description : In general, as you move across a period (left to right) electronegativity: w) increases x) decreases y) remains the same z) increases or decreases

Last Answer : ANSWER: W -- INCREASES

Proceeding across a period in the Periodic Table, what atomic size trend is observed?

Description : Proceeding across a period in the Periodic Table, what atomic size trend is observed?

Last Answer : ANSWER: ATOMIC SIZE DECREASES

As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density

Description : As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density

Last Answer : ANSWER: Y -- NUCLEAR CHARGE

In the periodic table of elements, on moving from left to right across a period, the atomic radius (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Last Answer : increases