Question

What is the atomic number of copper?

Answer 1

Hint: The atomic number of any element is defined by the number of protons its nucleus has; for example, hydrogen has a proton so, has atomic number as 1. Atomic number is the unique identity of an element i.e. none of the two elements have the same atomic number.

Complete answer:
Let us learn the basics;
The modern periodic table gives a certain amount of knowledge about the elements, their atomic and mass numbers. The table is divided into seven periods and eighteen groups in which the elements reside. The position of an element gives it’s atomic and mass number firmly.

Copper: Copper is the d-block element having the symbol as ‘Cu’. It is the element of the fourth period and eleventh group having properties such as high thermal and electrical conductivities along with malleable and ductile nature. It is lustrous with red-orange colour which is mostly used in jewellery, electrical wirings, etc.
The most stable form of copper existing in nature is ${}_{29}^{63}Cu$ which clearly signifies that the atomic number of the same will be 29. It has 29 electrons, 29 protons and 34 neutrons.

Note:
Do note that the number of neutrons may change in the nucleus of an atom which may change its mass number and the radioactive properties. But the number of protons will remain the same for an element in nature i.e. it is unique. Also, it is necessary to have a number of protons and electrons to be equal for a stable and neutral atom.