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Valence Electrons

State the val...

Question

State the valency of bromide ion.

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Solution

Bromine has the atomic number 35, which means it has 7 electrons in its valence shell. So bromide ion has a valency of -1.

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Q. (a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions.
(b) The valencies (or charges) of some of the ions are given below :

Ion	Valency (Charge)	Ion	Valency (Charge)
Sodium ion	1+	Bromide ion	1–
Ammonium ion	1+	Hydroxide ion	1–
Calcium ion	2+	Sulphate ion	2–
Lead ion	2+	Phosphate ion	3–

Using this information, write down the formulae of the following compounds :
(i) Sodium phosphate
(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide

Q. An element X has a valency of 2. Write the simplest formula for:
(a) Bromide of the element
(b) Oxide of the element

State the valency of chloride ion.

State the valency of hydroxide ion.

Q. Write the following reaction in the form of a word equation:

Sodium hydroxide reacts with calcium bromide to form calcium hydroxide and sodium bromide.

In

C a {B r}_{2}

, determine the valency of calcium.

The correct option regarding the word equation and the valency is

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