Electronics - Voltage and Current - Discussion

As electrons number gets changed while sharing, but electrons and protons no. Is always equal in an atom. So both can determine an atomic number. Maybe the answer is proton due to its consistency.

Proton is right. I agree with vinay.

But while sharing electrons number will change.

So we take proton number only.

Answer is proton.

The number of protons in an atom is the atomic number.

The number of protons is equal to the atomic number of an atom. It is very important in knowing the number of electrons that surround the nucleus of an atom. In an atom, the electrical charge is neutral, due to the equal number of positive (protons) and negative (electrons) charges. The atomic number represents the protons in an atom and also identifies the element. Hydrogen has one proton. No other atom has just one proton. Heluim has two protons and no other element has only two protons. Lithium has three protons and so on.

The atomic number is equal to the number of protons in the nucleus, and for neutral atoms, it is the same as the number of electrons. In an attempt to keep atoms and ions from getting confused with one another, it is best to think of atoms as always being electrically neutral and ions should be considered charged positively or negatively depending on whether electrons are gained or lost by an atom during the chemical combination of atoms in forming substances such as water, salt and rust found on metals. Protons in atoms and ions are always the same for a specific atom.

Every element has a unique atomic number, and so each element's identity is determined by the number of protons in its nucleus.

However, the same element can have different numbers of neutrons in its nucleus. Two atoms of the same element with two different numbers of neutrons in the nucleus are called isotopes. Also, note that if an atom is not charged (neutral) , then the number of protons must equal the number of electrons, and so the atomic number is also equal to the number of electrons in a neutral atom of each element.

However, if the atom is charged (and therefore called an ion) , it will have a different number of electrons orbiting it. If the number of electrons is less than the number of protons, it will be a positively charged ion, and the charge will equal the difference between the number of electrons and protons. The same is true if it has more electrons than protons, except now the charge will be negative.

This is a good explain about atomic number. So, I agree with you.

For any atom with atomic number N, atomic mass Z & no. of neutrons 'n', we have,

Atomic mass number= Z+n...(1)

So, atomic number N is given by

N=Atomic mass number - Atomic mass

=(Z+n)-Z

=n.

Which means that atomic number depends upon number of neutrons & hence 'D' should be the correct option.

Hence electron is the negative charges and neutron is the zero.

Obtion (B) is correct.

In an atom, no of protons are equal to the electrons. So whether it protons and electrons are sai to be correct.

In a nuetral atom the atomic number is equal to no of protons and also equal to no of electrons.

According to me
Atomic No= No.of protons or electrons in an atom.