Question

An element x has the same number of electron in the first and the fourth shell as well as in the second and the third shell. What is the formula and nature of its oxide

Answer 1

The element is Calcium (Ca).

Because it's electronic configuration is 2,8,8,2.

The oxide formed by calcium oxide it's formula is CaO.

Calcium oxide is basic in oxide as oxides of metals are basic in nature.

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Answer 2

Answer:

Element x is Calcium. The oxide of calcium is CaO.

Explanation:

• Calcium atom posses electronic configuration 1s² 2s²2p⁶3s² 3p⁶4s². It has two electrons in first(1s) as well as fourth shell (4s) and eight electrons in 2nd (2s2p) as well as 3rd shell (3s3p).
• Oxide of calcium is CaO, also known as quicklime.

Characteristics of Calcium oxide:

1. It is a caustic crystalline solid.
2. Formation is done by thermal decomposition of calcium carbonate.
3. It is highly reactive in air.
4. Basic nature of this oxide.