Question

The symbol for a radioactive nuclide is Superscript 234 subscript 90 upper T h.. Which statement is correct?

The atomic number of the radioactive nuclide is 90.
The mass number of the radioactive nuclide is 144.
The number of neutrons that are present in the nucleus of each atom is 324.
The number of protons that are present in the nucleus of each atom is 234.

Answer 1

A on EDG

Step-by-step explanation:

Answer 2

The correct statement : The atomic number of the radioactive nuclide is 90.

Further explanation

In the following element notation,

`\large {{{A} \atop {Z}} \right X}`

X = symbol of elemental atom

A = mass number

= number of protons + number of neutrons

Z = atomic number

= number of protons = number of electrons, on neutral elements

The symbol for a radioactive nuclide :

`\tt ^(234)_(90)Th`

atomic number = 90

mass number = 234

number of neutrons = 234-90=144

number of protons = atomic number = 90