Worksheetsstructure of atom
Total questions: 13
Worksheet time: 7mins
Which of the following correctly represent the electronic distribution in the Mg atom?
3, 8, 1
2, 8, 2
1, 8, 3
8, 2, 2
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted into discovery of
Electron
Proton
Nucleus in the atom
Atomic mass
Which of the following statements about Rutherford’s model of atom are correct?
(i) considered the nucleus as positively charged
(ii) established that the α–particles are four times as heavy as a hydrogen atom
(iii) can be compared to solar system
(iv) was in agreement with Thomson’s model
(i) and (iii)
(ii) and (iii)
(i) and (iv)
only (i)
An element has 3 valence electrons in its outermost 3rd shell, the name of element is
B
Al
Ga
In
Na+ has 12 neutrons and 10 electrons. Which of the following statement is correct?
Na+ has atomic number equal to 10 and mass number 22
Na+ has atomic number equal to 11 and mass number 23
Na+ has atomic number equal to 10 and mass number 23
Na+ has atomic number equal to 11 and mass number 22
How many electrons, protons and neutrons will be present in X–, if atomic number of X is 9 and mass number is 19 ?
E = 9, P = 9, N = 10
E = 10, P = 9, N = 10
E = 10, P = 10, N = 10
E = 9, P = 10, N = 10
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
13
10
14
16
What is the maximum number of electrons that are allowed on the second orbital?
9
7
8
3
The first model of an atom was given by
N. Bohr
E. Goldstein
Rutherford
J.J. Thomson
If Z=3 , what would be the valency of the element?
3
2
1
0
---------------------------- is defined as the number of protons present in the nucleus of an atom
(a)
Protium , deuterium , tritium are the isotopes of--------------
helium
hydrogen
carbon
--------------are defined as the atoms of the same element,having the same atomic number but different mass numbers
isotopes
isobars
