Explanation

Sodium (Na) is an alkali metal, highly reactive due to its single valence electron.

It reacts vigorously with water and air compared to Mg (less reactive) and Cl (a non-metal).

Explanation

Explanation

When atoms share electrons but have different electronegativities, the electron pair is unequally shared.

This unequal sharing creates a polar covalent bond.

Explanation

Configuration given:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁷

👉 Count total electrons:

1s² = 2

2s² 2p⁶ = 8 → total 10

3s² 3p⁶ = 8 → total 18

4s² = 2 → total 20

3d⁷ = 7 → total 27 electrons

➡ Atomic number = 27 → Cobalt (Co)

Explanation

KOH is a strong base and completely dissociates in water.

A 1 M solution gives pOH = 0 → pH = 14.

Explanation

Phenol was first isolated and extracted from coal tar in the 1830s as a by-product of coke manufacture.

Today, the majority of industrial phenol is synthesized from benzene, which is a petroleum-derived feedstock. 

Explanation

Explanation

Explanation

In the cumene process, phenol is produced along with acetone.

This industrial method relies on the co-production of both valuable chemicals, which helps to make the process economically viable. 

Explanation

Vertical columns in the periodic table are called groups.

Horizontal rows are called periods.