Question

part a
look at the model of a lithium atom. the red and blue subatomic particles found in the nucleus are the _ and _. the sum of these subatomic particles equals the atomic _.
a protons and neutrons; mass number
b protons and electrons; mass number
c protons and neutrons; atomic number
d protons and neutrinos; identification number
part b
which element would be in the same family as lithium?
a calcium
b beryllium
c sodium
d nitrogen

Explanation:

• Part A: In an atom, protons and neutrons are located in the nucleus. The mass number of an atom is the sum of the number of protons and neutrons. Electrons are outside the nucleus. The atomic number is the number of protons only. Neutrinos are not part of the atom's structure in this context.
• Part B: Elements in the same family (group) in the periodic table have similar chemical properties. Lithium (Li) is in Group 1 (alkali metals). Sodium (Na) is also in Group 1. Calcium (Ca) is in Group 2 (alkaline - earth metals), beryllium (Be) is in Group 2, and nitrogen (N) is in Group 15.

Answer:

A. protons and neutrons; mass number
C. sodium