Question

select the subatomic composition of a rubidium - 85 atom. refer to a periodic table. 48 protons, 48 neutrons, 37 electrons 37 protons, 37 neutrons, 48 electrons 37 protons, 48 neutrons, 37 electrons 48 protons, 37 neutrons, 48 electrons

Explanation:

Step1: Determine atomic number of rubidium

From periodic - table, atomic number of rubidium (Rb) is 37. Atomic number = number of protons. So, number of protons = 37.

Step2: Calculate number of neutrons

Mass number of rubidium - 85 is 85. Mass number = number of protons+number of neutrons. So, number of neutrons = 85 - 37=48.

Step3: Determine number of electrons

For a neutral atom, number of electrons = number of protons. So, number of electrons = 37.

Answer:

37 protons, 48 neutrons, 37 electrons