GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The number of electrons in an atom.
|
|
|
The number of protons in an atom.
|
|
|
The number of neutrons in an atom?
|
|
|
The total number of protons and neutrons in an atom.
|
Detailed explanation-1: -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. 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.
Detailed explanation-2: -At the upper left is the atomic number, or number of protons. In the middle is the letter symbol for the element (e.g., H).
Detailed explanation-3: -The number of protons in a nucleus is called the atomic number and always equals the number of electrons in orbit about that nucleus (in a nonionized atom). Thus, all atoms that have the same number of protons–the atomic number–are atoms of the same element.