Geometric Representation Of Atomic Structure

If the atomic number of an element is 6 and its mass number is 13, how many protons are

contained in the nucleus?

• 6

• 7

• 8

• 5

An atom that loses or gains electrons is called a(n)

• isotope.

• proton.

• neutron.

• ion.

Electronic configuration of ⁴⁰ Ca₂₀ is

• 2, 8, 10

• 2, 8, 8, 2

• 2, 8, 2, 8

• 2, 2, 8, 8

Which of the following does not have 8 valence electrons?

• Ar

• Ne

• Kr

• He

Which of the following correctly represents the electronic distribution in the Mg atom? .

• 3, 8, 1

• 2, 8, 2

• 1, 8, 3

• 8, 2, 2

An element has 3 electrons in the valence M Shell. The symbol of the element is ___.

• B

• Al

• Mg

• Ga

If K, L, M and N shells of an atom are full, the total number of electrons in that atom are

• 60

• 26

• 42

• 36

Na⁺ has 12 neutrons and 10 electrons. Which of the following statements is correct?

• Na⁺ has an atomic number of 10 and mass number 22.

• Na⁺ has an atomic number of 11 and mass number 23.

• Na⁺ has an atomic number of 10 and mass number 23.

• Na⁺ has an atomic number of 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

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)