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- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted into discovery of
Electron
Proton
Nucleus in the atom
Atomic mass
- Multiple ChoicePlease save your changes before editing any questions.
2, 8, 10
2, 8, 8, 2
2, 8, 2, 8
2, 2, 8, 8
- Multiple ChoicePlease save your changes before editing any questions.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
(i), (ii) and (iii)
(i), (iii) and (iv)
(ii), (iii) and (iv)
(i), (ii) and (iv)
- Multiple ChoicePlease save your changes before editing any questions.
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)
- Multiple ChoicePlease save your changes before editing any questions.
An element has 3 valence electrons in its outermost 3rd shell, the name of element is
B
Al
Ga
In
- Multiple ChoicePlease save your changes before editing any questions.
If K, L, M N, shells of an atom are full. The total number of electrons in that atom are :
60
26
42
36
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(ii) and (iv)
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
What is the maximum number of electrons that are allowed on the second orbital?
9
7
8
3
- Multiple ChoicePlease save your changes before editing any questions.
What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?
28
56
62
90
- Multiple ChoicePlease save your changes before editing any questions.
The isotopes of a same element have:
same mass number.
same atomic number.
different mass number.
both b & c.
- Multiple ChoicePlease save your changes before editing any questions.
Elements with valency 1 are
always metals
always metalloids
either metals or non-metals
always non-metals
- Multiple ChoicePlease save your changes before editing any questions.
The first model of an atom was given by
N. Bohr
E. Goldstein
Rutherford
J.J. Thomson
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following statement is always correct?
An atom has equal number of electrons and protons.
An atom has equal number of electrons and neutrons.
An atom has equal number of protons and neutrons.
An atom has equal number of electrons, protons and neutrons.
- Multiple ChoicePlease save your changes before editing any questions.
An atom has a mass number of 23 and atomic number 11. The number of protons is _________.
11
12
23
44
- Multiple ChoicePlease save your changes before editing any questions.
Carbon-12 atom has_______________.
6 electrons, 12 protons, 6 neutrons
12 electrons, 6 protons, 6 neutrons
6 electrons, 6 protons, 6 neutrons
18 electrons, 6 protons and 6 neutrons
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following in Fig do not represent Bohr’s model of an atom correctly?
(i) and (ii)
(ii) and (iii)
(ii) and (iv)
(i) and (iv)