Question

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

Answer 1

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

Answer 2

Answer:

A on EDG

Explanation: