Question

I don’t know how to do this when the atom is made like this please help

Answer 1

Atom having maximum mass : B

Atom which has least mass : C

Atom which is neutral : D

Identity of atom D : Lithium

Step-by-step explanation:

How to look at the Figure :

In the centre : Proton and neutrons are present

`\bigoplus = Proton`

`\bigcirc = Neutron`

In the rings (outside the centre): electrons are present

`\circleddash = electron`

Atomic mass : Total number of proton and neutrons present in the nucleus (centre) of the atom.

To calculate atomic mass count the following symbols :

Atomic mass = Proton + neutron

`\bigoplus`

`\bigcirc`

Figure A

`\bigoplus` = 4

`\bigcirc` = 3

Atomic mass = 4 + 3 = 7

Figure B

`\bigoplus` = 4

`\bigcirc` = 4

Atomic mass = 4 + 3 = 8

Figure C

`\bigoplus` = 3

`\bigcirc` = 3

Atomic mass = 3 + 3 = 6

Figure D

`\bigoplus` = 3

`\bigcirc` = 4

Atomic mass = 3 + 4 = 7

Part 1 .So B has maximum atomic mass = 8 amu

Part 2. C has minimum mass = 6 amu

To check whether atoms are neutral or charged :

Count the number of protons and electrons

`\bigoplus = Proton` = in the centre

`\circleddash = electron` = outside the centre

If the number of proton and electron are equal, then the atom is neutral

Proton = neutron

If the number of proton and electron are not equal, then the atom is Charged

Figure A. = Charged

`\bigoplus` = 4

`\circleddash` = 3

Figure B = Charged

`\bigoplus` = 4

`\circleddash` = 3

Figure C = Charged

`\bigoplus` = 4

`\circleddash` = 2

Figure D = Neutral (equal number of proton and electron)

`\bigoplus` = 3

`\circleddash` = 3

Part C .The atom which is neutral is D

Part DThe identity of Figure D : Lithium

Atomic number : Total number of proton in the nucleus of the atom

`\bigoplus` = 3 = Proton

So it is Lithium (See the periodic table)