An a is defined as the smallest part of an element that retains

the chemical identity of the element.

The scientist who first suggested that the structure of atoms is related to

electricity was F

$\text{'}$s cathode ray experiment led to the discovery of

e$.$

measured the charge of the electron by performing

c

experiments.

Rutherford performed $g$

experiment and discovered the

core of the atom known as the $n$

The

of an atom is defined as its number of

protons.

The mass number of an atom is its total number of $p.$

and

The approximate atomic mass of a neutron is

in amu while that

of an electron is essentially $0.$

Two atoms are isotopes if they contain the same number of

P but different number of $r$

${?}_9^{19}F$ contains

protons and

neutrons.

The a

the standard $C-12.$

$($amu$)$ is determined using

An $$

particle is the same as a helium nucleus.

$H-2$ has

protons,

electrons and

neutrons while $H-3$

has

protons,

electrons and

neutrons.

$A{l}^{3+}$ has

protons,

electrons and

neutrons.

In the equation ${?}_{16}^{35}Sx+{?}_{-1}^0,$ the missing symbol is

In the equation, ${?}_{84}^{210}POx+{?}_2^{4}He,$ the missing symbol is