Question

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Answer 1

Answer:

(a)The answer is Magnesium.

Explanation:

Group 2 and Period 3.

(b)This means having 2,8,2 electron configuration.(or 1s2,2s2,2p6,3s2 configuration whichever you like)

(c)2Mg + O2 --------> 2MgO

(d)MgO + H2O ----------> Mg(OH)2

(e)Refer diagram

Answer 2

Explanation:

$\underline{\underline{\bold{\mathtt{Answer \: A }}}}$

The Element is Magnesium

Reason:

Placed in 2nd group and 3rd perion in Modern periodic table

◾Atomic number is 12

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$\underline{\underline{\bold{\mathtt{Answer \: B }}}}$

It has 2 valence electrons

Electronic configuration is

⠀⠀⠀⠀⠀⠀⠀K ⠀L ⠀M

Mg ⠀⠀⠀⠀2⠀⠀8 ⠀2

Or in Spdf

$\boxed{\bold{\mathsf{1s^{2} 2s^{2} 2p^{6} 3s{2} }}}$

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$\underline{\underline{\bold{\mathtt{Answer \: C }}}}$

Magnesium when burnt in air gives magnesium oxide

Balanced chemical reaction:

$\boxed{\bold{\mathsf{2Mg + o_2 \rightarrow 2Mgo }}}$

Verify:

⠀⠀⠀⠀⠀Reactant side ⠀⠀⠀Product side

Mg ⠀⠀⠀⠀2⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀2

O⠀⠀⠀⠀⠀2 ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀2

Properties:

◾It is a white powder

◾Its melting point is 2850°C

◾It is also a white hygroscopic solid mineral.

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$\underline{\underline{\bold{\mathtt{Answer \:D}}}}$

When magnesium oxide is dissolved in water it slightly dissolve not fully

Balanced chemical reaction:

$\boxed{\bold{\mathsf{Mgo + H_2o \rightarrow Mg(oH)_2 }}}$

Observation:

◾Slightly dissolved in water

◾Magnesium hydroxide has been formed.

◾MgO is not very soluble in water

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$\underline{\underline{\bold{\mathtt{Answer \: E}}}}$

Refer to attached diagram