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svlad2 [7]
3 years ago
9

What element on the periodic table has a period of 3, and a group of 5?

Chemistry
2 answers:
nexus9112 [7]3 years ago
4 0

Answer:

In the 3rd period there are 8 elements.

Explanation:

k0ka [10]3 years ago
3 0

Answer:

The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block.

Explanation:

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The oxidation number of H is -1.

Sum of the oxidation numbers in each element = charge of the complex

CaH₂ has 1 Ca atom and 2H atoms. The charge of the complex is zero. Let’s say Oxidation number of H is "a".

Then,

<span>    (+2) + 2 x a = 0 </span>

<span>        +2  + 2a  = 0</span>

                  2a = -2

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Hence, the oxidation number of Hydrogen atom in CaH₂ is -1


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