Electronic Configuration

Q. Arrange the following elements in the increasing order of their atomic number.

1. Lithium
2. Magnesium
3. Fluorine
4. Helium
5. Nitrogen

Q. What is the chemical symbol of chromium?

1. $\text{C}$
2. $\text{Ch}$
3. $\text{Cr}$
4. $\text{Cl}$

Q. The symbol 'Co' is used for _____.

1. Copper
2. Calcium
3. Silver
4. Cobalt

Q. Classify each of the following on the basis of their atomicity

(a) F2 (b) O3 (c) S8 (d) He (e) P4 (f) Mg (g) N2

Q. Which of the following elements has its symbol given in the correct format?

1. Aluminium - Al
2. Zinc - ZN
3. Fluorine - f
4. Boron - B

Q. A homoatomic molecule is made up of atoms of the same element.

1. True
2. False

Q.

Atomic size ___ down the group. (increases/decreases)

Q. Write the number of valence electrons for the following atoms.

1. Carbon (C)
2. Phosphorus (P)
3. Potassium (K)
4. Oxygen (O)

Q. The symbol 'Co' is used for _____.

1. Cobalt
2. Silver
3. Calcium
4. Copper

Q. A metalloid used to make glass: ​

1. Silicon
2. Germanium
3. Sulphur
4. Antimony