G8 27-7

Elements with similar valence electron configurations are in the same ________.

• row

• column

• line

The following elements are belong to Group 1 EXCEPT.

• lithium

• calcium

• potassium

• rubidium

The p-block elements consist of all the elements of Groups 3A to 8A EXCEPT __________.

• Hydrogen

• Magnesium

• Helium

• Calsium

What does the number of proton tell us?

• electrons

• atomic number

• atomic mass

• neutrons

How many energy levels does an atom of Chlorine have?

• 2
• 3
• 4
• 7

Sodium (Na) is found in period

• 3

• 2

• 4

• 1

He had to make a disturbance in the ascending order of atomic weights of some elements G.R ?