Question

How many electrons, protons, neutrons are contained in each atom?

A) gallium-69
B) fluorine-23
C) titanium-48
D) tantalum-181

Answer 1

Step-by-step explanation:

When the name of an atom is given with a number, that number represents the atomic mass of the element. So, in this case, gallium-69 means that this gallium atom has an atomic mass of 69.

To calculate the number of electrons, protons and neutrons it is important to remember a few definitions:

- Atomic number: it is the number of electrons (and protons, the number is the same) of an atom. We can find this number in the periodic table.

- Atomic mass (Mass number): it is the sum of protons and neutrons that an atomic nucleus has.

A) Gallium-69:

Atomic number: 31

Atomic mass: 69

So, the number of electrons and protons is the same as the atomic number:

Electrons: 31

Protons: 31

Then, by making a subtraction between atomic mass and atomic number we obtain the number of neutrons:

Neutrons: atomic mass - atomic number = 69 - 31 = 38

We can do this with the other elements.

B) Fluorine-23:

Atomic number: 9

Atomic mass: 23

Electrons: 9

Protons: 9

Neutrons: 23 - 9 = 14

C) Titanium-48:

Atomic number: 22

Atomic mass: 48

Electrons: 22

Protons: 22

Neutrons: 48 - 22 = 26

D) Tantalum-181:

Atomic number: 73

Atomic mass: 181

Electrons: 73

Protons: 73

Neutrons: 181 - 73 = 108

Answer 2

The atomic number of a neutral atom is equal to the number of protons and the number of electrons of the atom. The atomic weight meanwhile is equal to the sum of the number of protons and number of neutrons. Hence

A. P-31, E- 31, N - 38

B. P = E = 9, N = 14

C. P = E = 22, N = 26

D. P = E = 73 , N = 108