the mass number of an element is 18 it contains 7 electrons what is the number of protons and neutrons in it what is atomic number of an element.
It has a charge of zero? If so than it has 7 protons and 11 neutrons
To determine the number of protons and neutrons in an element, we need to understand the concept of the atomic number and the mass number.
1. Atomic number: This represents the number of protons in an atom. It is denoted by the symbol "Z". The atomic number determines the element's identity and its position in the periodic table.
2. Mass number: This refers to the sum of protons and neutrons in an atom and is denoted by the symbol "A".
Let's use the given information to find the number of protons and neutrons in the element:
Given:
Mass number (A) = 18
Number of electrons = 7
To find the number of protons, we need the atomic number since the atomic number defines the number of protons. However, it is not provided directly in the question.
However, we can assume that the element is electrically neutral because the number of electrons (7) equals the number of protons in a neutral atom. Therefore, the atomic number (Z) is equal to the number of electrons, which is 7.
Now we have the atomic number (Z) = 7, and we can determine the number of protons.
Number of protons = Atomic number (Z) = 7
To find the number of neutrons, we subtract the number of protons (i.e., atomic number) from the mass number:
Number of neutrons = Mass number (A) - Number of protons = 18 - 7 = 11
So, the number of protons in the atom is 7, the number of neutrons is 11, and the atomic number of the element is 7.