Question

What is atomic number ?How it is represented?​

Answer 1

Answer:

number of proton in an atom is known as it's atomic number

it is represented on down right side of an element

Answer 2

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☞The term atomic number, conventionally denoted by the symbol Z, indicates number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom. The number of neutrons is represented by the neutron number (N).

Explanation:

➜What is Atomic Number?

• The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
• It is represented with the letter ‘Z.’
• All the atoms of a particular element have the same number of protons, and hence the same atomic number.
• Atoms of different elements have different atomic numbers.
• For example, all carbon atoms have the atomic number of 6, whereas all atoms of Oxygen have 8 protons in their nucleus.

✧History of Atomic Number:-

• We take the existence of atoms for granted – yet for centuries no one believed in them. Around 2500 years ago a Greek philosopher called Leucippus and his pupil Demokritos put forward the idea that the universe is made up of tiny indivisible particles, which they called atoms. Unfortunately the great Greek philosopher Aristotle did not agree with them. As Aristotle views were accepted throughout Europe for almost 2000 years the idea of atoms was shelved for centuries to come.

• Atoms are the building blocks of matter. They combine in numerous patterns and form different substances. All atoms except the common form of hydrogen contain protons, neutrons and electrons. The atomic number of an element is equal to the number of protons in its nucleus. In a neutral atom, the number of protons equals the number of electrons in shells that is the energy level around the nucleus.

➝Examples of Atomic Number:-

The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom.

Atomic number = Number of protons

For example, in a sodium atom, there are 11 electrons and 11 protons. Thus the atomic number of Na atom = number of electrons = number of protons = 11.