Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
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.
Description : For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons , neutrons and electrons respectivel
Last Answer : For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons ... C. 29 , 34 ,29 D. 29 , 29 , 29
Description : The simplest formular of a compound containing 50% of element X (atomic mass 10) and 50% pf element Y (atomic mass 20) is :-
Last Answer : The simplest formular of a compound containing 50% of element X (atomic mass 10) and 50% pf element Y (atomic mass 20) ... C. `XY_(3)` D. `X_(2)Y_(3)`
Description : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :-
Last Answer : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :- A. 10 amu B. 2.3 amu C. 35.5 amu D. 23 amu
Description : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the
Last Answer : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic ... )^(234)Th` D. `._(91)^(234)Pa`
Description : Why is the atomic mass of an element is usually not given as a whole number even though each individual atom of the element has a whole number of protons and neutrons.?
Last Answer : It's the electrons that throw it off.
Description : How many neutrons does element x have if its atomic number is 22 and its mass number is 84?
Last Answer : Need answer
Description : If an atomic number of an element is 6 and its mass is 14 how many neutrons are contained in the nucleus?
Last Answer : jjjj
Description : Which one of the following is the most characteristic property of an element? (a) Density (b) Boiling point (c) Mass number (d) Atomic number
Last Answer : Ans:(d)
Description : An atom of an element with mass number 23 and atomic number 11 will have- (1) 11 neutrons, 12 protons and 11 electrons (2) 11 protons, 12 neutrons and 11 electrons (3) 11 protons, 12 electrons and 11 neutrons (4) 23 protons and 11 electrons
Last Answer : (2) 11 protons, 12 neutrons and 11 electrons
Description : All isotopes of the same element have (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass
Last Answer : (3) the same atomic number but different atomic masses Explanation: Isotopes are forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei. So they have the same atomic number, but differ in relative atomic mass.
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– (1) 17 (2) 19 (3) 36 (4) 53
Last Answer : (2) 19 Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
Description : The umber of neutrons present in an element having mass number 226 and atomic number 88 is– (1) 88 (2) 138 (3) 314 (4) 50
Last Answer : (2) 138 Explanation: The mass number is a count of the number of particles in an atom's nucleus which is made up of protons and neutrons. In other words, Mass Number = Number of Protons + Number of Neutrons. ... of an element, 226 = 88 + number of Neutrons. So, the number of neutrons= 226 - 88= 138.
Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it–
Last Answer : 19
Description : The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is (A) 1 (B) 0.5 (C) 2 (D) 4
Last Answer : (A) 1
Description : The atomic mass of an element is fractional, because (A) Of uncertainty principle (B) It may have isobars (C) It contains neutrons (D) It may have isotopes
Last Answer : (D) It may have isotopes
Description : Isotopes of an element have the same (A) Number of neutrons (B) Mass number (C) Electronic configuration (D) Atomic weight
Last Answer : (C) Electronic configuration
Description : Atoms of the same element having same atomic number and different mass number are known as?
Last Answer : Isotopes
Description : In a triad A, B and C, the atomic masses of A and B are 80 and 120 respectively. What is the atomic mass of element C?
Last Answer : Atomic mass of A=80 Atomic mass of B=120 A C 2 Atomic mass of B = 80 C 2 120x2 80 C 120 240 C 80 C 240 80 C 160
Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it
Description : All isotopes of the same element have ______ (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass
Last Answer : the same atomic number but different atomic masses
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is (1) 17 (2) 19 (3) 36 (4) 53
Description : The number of neutrons present in an element having mass number 226 and atomic number 88 is : (1) 88 (2) 138 (3) 314 (4) 50
Last Answer : 138
Description : If a sample of pure sodium has a mass of 8.2 grams and sodium has an average atomic mass of 22.99 gmol how many sodium atoms are there in the sample?
Description : How do you calculate average atomic mass?
Description : Define average atomic mass.
Last Answer : Ans. Average atomic mass is the average of atomic mass of all the isotopes of an element.
Description : If the atomic number of an element increases, then density will increase as well because...?
Last Answer : Not necessarily—(although generally so)—Lead (82) is less dense than Osmium (76) at STP. Mostly because, “it’s complicated” =)
Description : 1The elements of the second period of the Periodic Table are given below: Li Be B C N O F (a) Give reason to explain why atomic radii decrease from Li to F. (b) Identify the most (i) metallic and (ii)non-metallic element. -Science
Last Answer : a) It is because nuclear charge increases due to increase in atomic number, therefore, force of attraction between nucleus and valence electrons increases, i.e. effective nuclear charge increases, hence ... element is ‘F’ because it can gain electrons easily due to smallest atomic size.
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.
Description : What is the atomic number of the element which has 3 electrons in its M shell?
Last Answer : Answer: 13.
Description : The element with the minimum atomic number having 8 electrons in the outer most shell is what?
Last Answer : Answer: Neon.
Last Answer : The 104th element is named after the scientist Rutherford.
Description : (A) During `beta`-decay, a new element with atomic number greater than one is obtained. (R ) Protons and neutrons keep on changing into one another th
Last Answer : (A) During `beta`-decay, a new element with atomic number greater than one is obtained. (R ) Protons and ... D. If both (A) and (R ) are incorrect.
Description : A radioactive element `X` has an atomic number of 100. It decays directly into an element `Y` which decays directly into an element `Z`. In both the p
Last Answer : A radioactive element `X` has an atomic number of 100. It decays directly into an element `Y` which decays ... of 100 D. Z has an atomic number of 99
Description : An element with atomic 25 lies in group 7, then the atomic number of element which also lies in the same group is
Last Answer : An element with atomic 25 lies in group 7, then the atomic number of element which also lies in the same group is (A) 75 (B) 42 (C) 50 (D) 80
Description : What is the group 14 element with the lowest atomic number?
Last Answer : This chemical element is carbon(C).
Description : How can atomic numbers be used distinguish one element from another?
Last Answer : they can distinguish one element from another becasue by theprotons and the nuetrons , they can over come almost anything.
Description : What atoms of the same element but with various atomic weights?
Last Answer : These are the isotopes.
Description : What is the element in period 4 with the smallest atomic radius?
Last Answer : What is the noble gas element with the largest radius
Description : What is the element with the atomic number 100?
Last Answer : Fermium. To find this type of information, you look at a Periodic Table. You will find a really useful one here: www.rsc.org/periodic-table/?gclid=CjwKEAjw2MOhBRCq-Nr87_j-lDASJAAl4FNhssVbsyCT_UjwmmrpVjUngib6tHybHy88YrC1gH_1shoCZDzw_wcB
Description : What element has the atomic number of 84?
Description : What element has an atomic number lower than that of aluminum and one less valence electron than group 16 elements?
Last Answer : Nitrogen
Description : What is the atomic way of an element whose Adam's contain a protons 8 elecktronicks and 8 neutrons?
Last Answer : An oxygen atom contains 8 protons and 8 neutrons in its center,and 8 electrons in various levels outside its center.
Description : All atoms with the same number of ______ in the atomic nucleus are the same element?
Last Answer : progdk
Description : Dentification: Atoms of the same element but with various atomic weight?
Last Answer : Isotope
Description : Which one among the following most correctly determines the atomic number of an element?
Last Answer : Number of electrons