Question

an alkaline earth metal in period 3

Answer 1

The elements in the alkaline earth metals group; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), have two electrons in their outer electronic shell.

Answer 2

Magnesium is the alkaline earth metal present in period 3 of the periodic table.

Explanation:

• The periodic table is composed of 18 groups and 7 periods. Out of 18 groups, the elements present in group 2 are called alkaline earth metals.
• The names of the alkaline earth metals present in group 2 are as follows:

1. Beryllium (Be)
2. Magnesium (Mg)
3. Calcium (Ca)
4. Strontium (Sr)
5. Barium (Ba)
6. Radium (Ra)

• The names of the elements present in period 3 are as follows:

1. Sodium (Na)
2. Magnesium (Mg)
3. Aluminium (Al)
4. Silicon (Si)
5. Phosphorus (P)
6. Sulfur (S)
7. Chlorine (Cl)
8. Argon (Ar)

• When the elements present in group 2 and period 3 are compared, magnesium is present in both categories.
• Thus it is inferred that the alkaline earth metal present in period 3 is magnesium.

Learn more about alkaline earth metal

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Question 10.6 Compare the alkali metals and alkaline earth metals with respect to

(i) ionization enthalpy

(ii) basicity of oxides and

(iii) solubility of hydroxides.

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