Question

An element Barium has atomic no. 56.Look up its position in the periodic table and answer the following questions.
1)Is it a metal or non metal?
2)is it more or less reactive than calcium?
3)what is its valency?
4)what will be the formula of its phosphate?
5)is it larger or smaller than Cs in size?

Answer 1

Barium (Ba) - Atomic number 56.

Explanation:

1. Barium is placed in Group II of the periodic table. Group II elements are metals, so Ba is a metal.
2. Reactivity increases as we move down a group. Barium is below Calcium in Group II. So Barium is more reactive than Calcium as it has more number of shells and the nuclear attraction is lower in the outer shell causing it to lose electron easily.
3. Valency of Barium is 2.
4. Valency of Barium is 2 and phosphate ion is 3. So the formula of Barium phosphate will be (Ba)3(PO4)2.
5. Atomic size decreases from left to right across a period because, within a period, all electrons are added to the same shell. The valence electrons are held closer towards the nucleus of the atom. Ba is to the right of Cs. So Barium is smaller than Cesium in atomic size.

Answer 2

Answer:

1. It is a metal.

2. It is more reactive.

3. It's valency is 2.

4. Formula will be Ba3 (PO4)2.

5. It is smaller than caesium is size.

Explanation:

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