6.0 PERIODIC TABLE (CHEMISTRY DK014)

Which of the following is the electronic configuration of a Group 3 element?

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹

An element X has the electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷. It is likely to be

• A transition metal

• A group 7 element

• A group 17 element

• A s block element

In the modern Periodic table, the elements are arranged in the order of increasing

• Relative atomic mass

• Proton number

• Nucleon number

• First ionisation energy

The atomic radius of the group 1 element generally increases down a group because

• The effective nuclear charge increases

• The number of electrons increases

• The number of shells increases

• The number of protons increases

Which of the following atoms has the smallest size?

• N

• Be

• P

• Ne

An element M have a np⁵ electronic configuration in its outermost sub-shell. M is likely to be found in group

• 5

• 7

• 15

• 17

Which of the following ions has the largest size?

• P^3-

• Cl^-

• Na⁺

• Al³⁺

Determine the period, group and block for the following electronic configuration,

1s² 2s² 2p⁶ 3s² 3p⁵

• Group 15, Period 3, s-block

• Group 7, Period 3, p-block

• Group 17, Period 3, p-block

• Group 5, Period 3, s-block

Determine the period, group and block for the following electronic configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵

• Group 5, Period 3, s-block

• Group 7, Period 4, d-block

• Group 17, Period 3, d-block

• Group 17, Period 4, d-block

Element Q has the following electronic configuration:

1s² 2s² 2p⁴

Which of the following statements is/are true about Q?

i. Q is an element of group 16

ii.Q can form Q^2- ion

iii. Q is an element in a s-block

iv. Q is an element in p-block

• ii, iii, iv

• i, ii, iv

• iii and iv

• ii and iv