Question

An element x has atomic number 19 what will be the formula of its oxide and chloride

Answer 1

potassium has atomic number 19

formula of its oxide is K2O

formula of its chloride is KCL

Answer 2

The formula of its oxide and chloride will be $K_2O$ and  $KCl$  respectively.

Explanation:

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

For an electrically neutral atom,

Atomic number = Number of electrons = Number of protons

Atomic number of 19 is for potassium, thus contains 19 electrons.

$K:19:1s^22s^22p^63s^23p^64s^1$

Thus it can loose electron to get stable and form $K^+$

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Thus $K^+$ will combine with $O^{2-}$ and valencies are exchanged to form $K_2O$ oxide.

Thus $K^+$ will combine with $Cl^{-}$ and valencies are exchanged to form $KCl$ chloride.

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