Question

molecular formula of the chloride of an element X is XCI . this compound is a solid having high melting point . which of the following elements br present in same group as X .
1) Na
2) Mg
3) Al
4) Si​

Answer 1

The Molecular form of Chloride of an element is XCl

This means that

• Valency of x is 1
• Valency of y is 1

Therefore, it belongs to the alkali metal group.

Also, it is given that the element should be solid at room temperature.

So, it cannot be Hydrogen

Other elements that have 1 valency are Lithium, Potassium, Rubidium, etc. Since only Sodium(Na) is given in the options

The element is Na

Additional information

• Metals donate electrons and so become positively charged
• Non-metals accept electrons and so become negatively charged.
• All elements in Group 1A of the periodic table are known as Alkali Metals

Answer 2

Explanation:

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