Question

the atom of an element has 25 electrons and 30 neutron write down its atomic number and mass number.​

Answer 1

Answer:

It is manganese. You have 25 electrons which means you will have 25 protons (because the atom will have to be neutral unless otherwise stated), and the element with the atomic number of 25 is manganese

Explanation:

atomic mass of mn

54.938

The number below the symbol for an element.

Mn (Manganese) is in group 7, period 4 (Row 4, Column 7)

Answer 2

Answer: Atomic Number - 25  Mass Number - 55

Explanation: The atomic number is made up of the number of protons. The number of protons is equal to the number of electrons so since there are 25 electrons there are 25 protons as well.

The mass number is made up of the number of protons plus the number of neutrons.

Since the number of protons was found to be 25 you add that to 30 ( the number of neutrons).

25 + 30 = 55