What is the correct number of protons, neutrons, and electrons, respectively if lithium has an atomic number of 3 and a mass number of 7?

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Asked by Awilliams, Last updated: Nov 09, 2024

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3 Answers

H. Barnes, Unemployed, Barnes, Atlanta

Answered Mar 07, 2019

The correct answer is option 3,4,3.
The atomic number of lithium is 3.
Therefore, the number of proton is 3
The number of electrons is same as the number of proton = 3
The mass of lithium as stated above is 7
Mass number = 7
Mass number = number of proton + number of neutrons
Number of neutrons = Mass number – number of protons
No of neutrons = 7 – 3
= 4
There the lithium correct number of proton, neutrons and electrons respectively is 3, 4, 3.

M. Parker, Internet Researcher, Houston

Answered Feb 19, 2019

3,4,3. Protons, neutrons, and electrons are the three basic parts of an atom. The electron is a negatively charged molecule that is located at the center of the atom in the nucleus. The neutron does not have any charge.

The number of neutrons affects the mass and radioactivity of the atom. The easiest way to find the number on the periodic table. That number is the number of protons. The easiest way to find the number is equal to the number of protons, neutrons, and electrons.

Identify the net charge. Subtract the charge from the atomic number. Add the charge to the atomic number. Add the charge to the atomic integer for negative ions. This is how to find the number of protons, neutrons, and electrons. Protons and neutrons make up the nucleus.