A) Isotope
B) Atomic Number
C) Atomic Mass Number D) Proton
H) Ion
E) electron
F) Neutron
G) Nucleus
1) has a positive charge
2) where the proton is found
3) is the sum of the neutrons and the protons
4) an element with different number of neutrons
5) has no charge
6) where the neutron is found
7) is the lightest particle
8) has a charge of -1
9) Elements with different number of electrons
10) The number of protons in
an element
11) Particle that distinguishes the elements from one another
12) Particle found outside the nucleus

By matching the column A to G and 1 to 11, the correct answers are given below.

Explanation:

A) Isotope - 9) Elements with different number of electrons

B) Atomic Number - 10) The number of protons in an element

C) Atomic Mass Number - 3) is the sum of the neutrons and the protons

D) Proton - 1) has a positive charge

H) Ion - 8) has a charge of -1

E) electron - 12) Particle found outside the nucleus

F) Neutron - 5) has no charge

G) Nucleus - 2) where the proton and the neutron is found

it was given away at no charge

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.