Description : Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.
Last Answer : Ans : Mendeleeve's Law of Classification : Mendeleeve in 1869 arrange elements in order of increasing atomic masses. He placed chemically similar elements vertically beneath each other & concluded that : The ... metals. No Idea Of Atomic Structure : It failed to give the idea of atomic structure.
Description : Ch 5 – Periodic Classification of Elements
Last Answer : Ch 5 – Periodic Classification of Elements notes
Description : The elements of the third period of the Periodic Table are given below: periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1 (a) Which atom is bigger, Na or Mg? Why? (6) Identify the most (i) metallic and (ii) non-metallic element in Period 3. -Science
Last Answer : (a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, ... the most non-metallic element because it can gain electrons easily due to its smallest atomic size.
Description : What is the need for periodic classification of elements?
Last Answer : When elements are classified such that they have the same properties, study of large number of elements is reduced to study of few groups of elements.
Description : The carbon atom wh ich becomes asymmetric when the straight chain form of monosaccharide changes into ring form is known as CARBOHYDRATES AND CARBOHYDRATE METABOLISM 9 (A) Anomeric carbon atom (B) Epimeric carbon atom (C) Isomeric carbon atom (D) None of these
Last Answer : A
Description : Elements present in the 2nd Group of the Periodic Table are also called ?
Last Answer : Ans alkaline earth metals
Description : Name the elements present in the 2nd Group of the Periodic Table:
Last Answer : Ans beryllium, magnesium, calcium, strontium, barium and radium
Description : Which group elements show very low ionization enthalpy in the periodic table?
Last Answer : First group elements (alkali metals)
Last Answer : beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metals.
Description : Name the elements present in the 1st Group of the Periodic Table
Last Answer : lithium, sodium, potassium, rubidium, caesium and francium. They are collectively known as the alkali metals.
Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.
Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Description : Name this chemical element. The principal use of this element has been in solid-state electronic devices, notably transistors. Its position in the periodic table is in group "4A". The element's atomic number is 32 and its chemical symbol is Ge.
Last Answer : ANSWER: GERMANIUM
Description : What is the family name given to the elements in group 1A of the periodic table?
Last Answer : ANSWER: ALKALI METALS
Description : The elements in group 1A of the periodic table are called: w) halogens x) alkaline earths y) alkali metals z) rare earths
Last Answer : ANSWER: Y -- ALKALI METALS
Description : Four elements that comprise over 95% of the human body are _____.
Last Answer : they are in the deoxidenucleic acid they are nitrogen phosapate and sugar and some water
Description : I will be describing a chemical element. Try to identify it with the fewest number of clues. This element is a halogen wh is a liquid at standard conditions. The element volatilizes readily at ro ... . The atomic number of this element is 35 and its chemical symbol is Br. Name this element.
Last Answer : ANSWER: BROMINE
Description : Which are the only two elements on the periodic table that are liquid at room temperature? A. Mercury and Bromine (Answer) B. Carbon and helium C. Nitrogen and Hydrogen D. Oxygen and Neon
Last Answer : A. Mercury and Bromine (Answer)
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.
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.
Description : What is the number of elements in the zero group of the periodic table ?
Last Answer : The number of elements in the zero group of the periodic table is 6 .
Description : In which group of elements of the modern periodic table are halogen placed ?
Last Answer : In which group of elements of the modern periodic table are halogen placed? a. 17 b. 6 c. 4 d. 2
Description : What structural feature of their atoms is characteristic of elements in a group of the periodic table?
Last Answer : The Periodic Table also has a special name for its vertical columns. Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.
Description : List the elements of 15 th group of the periodic table. Name the distinct metals and non-metals of the group.
Last Answer : Nitrogen and phosphorous are non-metals. Arsenic and Antimony are metalloids, Bismuth is a metal.
Description : Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same (A) Period increases (B) Period decreases (C) Group increases (D) Both 'b' & 'c'
Last Answer : Option D
Description : Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is, (A) Q = Wh/6 (S + 2.5) (B) Q = Wh/2.5 (S + 6) (C) Q = (W × 6)/h (S + 2.5) (D) Q = (W × 2.5)/6 (S + h)
Last Answer : Answer: Option A
Description : Would Trump’s brand of politics help in putting another Republican in the WH or not?
Last Answer : I freaking hope NOT! But again the right can be unpredictable ,and bat shit crazy at times.
Description : What is the cheapest rechargeable AA per ACTUAL Wh not claimed capacity.
Last Answer : answer:NiMH is what you want. NiCads are cheaper but lack capacity, and anything Lithium is relatively expensive by any metric.
Description : How many Wh of heat does each Hot Hands packet offer?
Last Answer : answer:I do not have the absolute scientific answer for you but I do have a subjective one that might help others answer your question. First I commend you for asking the question in the form ... $0.00084 = ~ 0.1 cents Batteries and chemical heaters are very expensive when compared with electricity.
Description : A son went to his father's house and knocked on the door. When his father answered the door, the son said, 'O.K., today is the day I promised to burn your house to the ground.' 'But I ... 'Well, I guess you're right,' said his father. The son then promptly escorted his father outside, wh -Riddles
Last Answer : The father, although he owned a fully functioning home, had never been able to break himself from the habit of going to the bathroom in the Outhouse he had built for his family back in 1941. The son, ... the son had been trying for some time to get his father to agree to let him burn it down.
Description : title : wh- question
Last Answer : WH-question is also called question word . These interrogative words contain the letters " W" and " H" . That is why they are called wh-question .
Description : The ratio of the monthly earnings of A and B is ` 3 : 2` . The ratio of the monthly expenditures of A and B is ` 4 : 3` A saves Rs. 300 each month. Wh
Last Answer : The ratio of the monthly earnings of A and B is ` 3 : 2` . The ratio of the monthly expenditures of A and B ... (in Rs.) A. 180 B. 195 C. 165 D. 205
Description : The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery wh
Last Answer : The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E ... current in the potentiometer wire D. `(30E)/(100)`
Description : I need help with finding out wh sent a bill to collections for my husband. On my credit report it shows Medical payment data. Marie?
Last Answer : You can contact any of the 3 major credit bureaus to find out more information on the medical payment that was late.
Description : i need help with finding out wh sent a bill to collections for my husband. On my credit report it shows Medical payment data.?
Last Answer : Contact the credit reporting agency that issued the report and challenge the entry. Tell them you have no idea what it represents or who it is from. They will research the item. Many credit reports have incorrect information on them. It pays to check them frequently. Good Luck.
Description : The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) (A) wH/2 (B) wH (C) wH2 /2 (D) wH2 /4
Last Answer : Answer: Option C
Description : A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid) (A) wH (B) wH/2 (C) wH2 /2 (D) wH2 /3
Description : The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface) (A) w (B) wh (C) w/h (D) h/w
Last Answer : Answer: Option B
Description : w k intensity at that point will be (A) h (B) wh (C) w/h (D) h/w
Description : If is the angle of repose of soil of weight w kg/m3 , the horizontal pressure p at a depth of h metres per metre length of wall, is (A) wh × [(1 - sin )/(1 + )] (B) (wh/2) × [(1 - sin )/(1 + )] (C) wh - sin )/(1 + )] (D) wh )/(1 - )
Description : Marketing effo ing efforts, wh rts, which incl ich include publi ude public health ca c health campaigns to reduc ns to reduce smoki e smoking, alcoh ng, alcoholism, drug abuse, and overeating are called _____. a. specialty product b. social marketing social marketing c. shopping product
Last Answer : b. social marketing social marketing
Description : Botanical Words Alphabetical List - WH
Last Answer : WHORL: Where three or more organs, such as leaves or petals, arise from the same point and form a circle around it.
Description : In the second and third stages of the periodic table, after how many elements does religion repeat ?
Last Answer : In the case of the second and third stages of the periodic table, religion repeats itself after the eight elements.
Description : What is a Periodic Table of Elements ?
Last Answer : By classifying the elements of the same type of religion in the same category , replacing all the discovered elements , the current table of elements is called the periodic table of elements.
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).
Description : Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic Table? (1) Scandium (2) Gallium (3) Titanium (4) Germanium
Last Answer : (2) Gallium
Description : Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum
Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium
Description : Who is given credit for first arranging the elements in the Periodic Table?
Last Answer : ANSWER: MENDELEEV
Description : The block of elements in the periodic table which are filling the 4-f electron shell are known as:
Last Answer : ANSWER: LANTHANIDES
Description : Four of the lightest ten elements in the periodic table are solids at standard temperature and pressure. Name these four elements.
Last Answer : ANSWER: LITHIUM, BERYLLIUM, BORON, CARBON
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