Question

here is a description of lithium from the periodic table.
a) what does the number \3\ represent for lithium?

b) what does the number 6.94 represent for lithium?

c) what are the main parts that make up an atom?
and

Explanation:

• Part A: In the periodic table, the atomic number (the whole number) of an element represents the number of protons in the nucleus of an atom of that element. For lithium (\(Li\)), the atomic number is \(3\), so it represents the number of protons.
• Part B: The number \(6.94\) is the atomic mass of lithium. The atomic mass (also called the atomic weight) of an element is the weighted - average mass of the atoms of the element, taking into account the relative abundances of its isotopes.
• Part C: An atom is composed of three main parts. The nucleus contains protons (positively - charged particles) and neutrons (neutrally - charged particles). Surrounding the nucleus are electrons (negatively - charged particles) that move in electron shells or orbitals.

Answer:

A) The number of protons in a lithium atom.
B) The atomic mass of lithium.
C) Protons, neutrons, and electrons.