Question

What element has a mass number $65$

Answer 1

Hint: The Mass number of any element is simply known as the atomic mass of the element. There are total $118$ elements in the periodic table. Each element of the periodic table has its unique mass number.

Complete step-by-step answer:
The total number of protons and neutrons (collectively known as nucleons) in an atomic nucleus is known as the mass number, also known as the atomic mass number or nucleon number. It is roughly equal to the atom's atomic mass (also known as isotopic mass) expressed in atomic mass units.
Zinc is the element that has a mass number of $65$. Its atomic number is $30$.

Zinc (Zn) is a chemical element that is important to live and is one of the most commonly used metals. It belongs to Group $12$of the periodic table and it is the first element of a group $12$. Zinc is a significant commercial commodity.

At room temperature, zinc is a slightly brittle metal with a silvery-greyish appearance when oxidation is removed. Zinc and magnesium are chemically identical in several ways: both have only one natural oxidation state $( + 2)$ and the $Z{n^{2 + }}$ and $M{g^{2 + }}$ ions are similar in size.

Since very small amounts of zinc are required for human health, it is referred to as an "essential trace element." Since the human body does not store excess zinc, it must be ingested on a daily basis. Zinc is found in red meat, poultry, and fish, among other foods.

Note: Copper has one stable isotope which has a mass number of $65$, which is known as copper-$65$. The atomic number (number of protons) of an element's isotopes is the same, but the number of neutrons is different. The mass number of an isotope gives it its name.