Question

objective types...........​

Answer 1

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1) The electronic configuration of magnesium is 2 , 8 , 2

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More information :

Electronic configuration => The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals

The arrangements will be according to the shell

We have K , L , M , N , so one shells

We have a formula to distribute the shell 2n²

According to this we distribute magnesium electron

Magnesium electron Number is = 12

K shell = 2

L shell = 8

M shell = 2

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

2) one molecule oxygen atom contains two Number of oxygen atom .

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More information:

A one molecule of oxygen contain two numbers of oxygen atom ... Oxygen O2 it is diatomic

So oxygen will used to distinguish the diatomic molecule from two single oxygen atoms.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

3) The speed of sound in dry air at 0° C is 331.3 m/s.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

4) The weight of an object on the moon is light of it's weight in Earth

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More information :

Mass of a body does not change with change in gravity. So mass of a b dy will remain the same on moon.

❍❍❍❖ - ❖❍❍❍❍❍❍❖ - ❖❍❍❍

5) The mass Number of Sodium is 22.990 atomic mass units

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More information :

Mass Number => The total number of protons and neutrons in a nucleus.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

Answer 2

1) The electronic configuration of magnesium is 2 , 8 , 2

___________________________________

More information :

Electronic configuration => The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals

The arrangements will be according to the shell

We have K , L , M , N , so one shells

We have a formula to distribute the shell 2n²

According to this we distribute magnesium electron

Magnesium electron Number is = 12

K shell = 2

L shell = 8

M shell = 2

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

2) one molecule oxygen atom contains two Number of oxygen atom .

_____________________________________

More information:

A one molecule of oxygen contain two numbers of oxygen atom ... Oxygen O2 it is diatomic

So oxygen will used to distinguish the diatomic molecule from two single oxygen atoms.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

3) The speed of sound in dry air at 0° C is 331.3 m/s.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍

4) The weight of an object on the moon is light of it's weight in Earth

_____________________________________

More information :

Mass of a body does not change with change in gravity. So mass of a b dy will remain the same on moon.

❍❍❍❖ - ❖❍❍❍❍❍❍❖ - ❖❍❍❍

5) The mass Number of Sodium is 22.990 atomic mass units

____________________________________

More information :

Mass Number => The total number of protons and neutrons in a nucleus.

❍❍❍❖-❖❍❍❍❍❍❍❖-❖❍❍❍