Structure of Atom - Practice for Everyone

1.

2, 8, 8 is the electronic configuration of which of the following species?

(a) Argon

(b) Calcium

(c) Ca2+ and Ar

(d) Potassium

2.

Dalton’s atomic theory successfully explained

(a) (i), (ii) and (iii)

(b) (i), (iii) and (iv)

(c) (ii), (iii) and (iv)

(d) (i), (ii) and (iv)

3.

Which of the following is the electronic configuration of aluminium Al +3?

(a) 2, 8, 3

(b) 2, 8

(c) 2, 8, 6

(d) 2, 8, 8, 3

4.

Which of the following statements about Rutherford’s model of atom are correct?

(a) (i) and (iii)

(b) (ii) and (iii)

(c) (i) and (iv)

(d) Only (i)

5.

Which of the following is true for an element?

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (ii) and (iv)

6.

In Thomson’s model of the atom, which of the following statements is correct?

(a) (i), (ii) and (iii)

(b) (i) and (iii)

(c) (i) and (iv)

(d) (i), (iii) and (iv)

7.

Identify the Mg2+ ion from the given figures, where n and p represent the number of neutrons and protons respectively.

(a) Option (a)

(b) Option (b)

(c) Option (c)

(d) Option (d)

8.

Which of the following statements is correct about the atoms of elements given below:

(a) These are isotopes with the same number of neutrons

(b) These are isotopes with the same number of protons

(c) These are isobars with same mass number

(d) These are isobars with the same number of neutrons.

9.

If an element has 5 electrons, and 6 neutrons, identify the correct statement about this.

(a) The element has atomic number 5, valency +3, and mass number 11

(b) The element has atomic number 6, valency +3, and mass number 11

(c) The element has atomic number 6, valency +5, and mass number 5

(d) The element has atomic number 5, valency +5, and mass number 11

10.

Identify the incorrect statement

(a) the outermost shell of an atom is known as the valence shell.

(b) The number of electrons present in the valence shell or outermost shell is known as valence electrons.

(c) the combining capacity of an element is known as its valency.

(d) The valency of the element is zero if it has 9 electrons in its valence shell.

11.

Assertion (A): Rutherford selected a gold foil for his scattering experiment. Reason (R): Gold foil could be converted into a thin layer of about 1000 atoms thick.