Question

An uncharged atom of gold has an atomic number of 79 and an atomic mass of 197. this atom has ______ protons, ______ neutrons, and ______ electrons. an uncharged atom of gold has an atomic number of 79 and an atomic mass of 197. this atom has ______ protons, ______ neutrons, and ______ electrons. 276 . . . 118 . . . 79 118 . . . 79 . . . 118 118 . . . 276 . . . 118 79 . . . 276 . . . 79 79 . . . 118 . . . 79

Answer 1

The atomic number is 79, therefore the atoms have 79 protons in their nuclei. Since the atom is uncharged, the number of protons equals the number of electrons: 79 electrons. The atomic mass is number of protons + neutrons. Since atomic mass is 197, 197-79= 118 neturons

Answer 2

Answer:

79 protons, 79 electrons and 118 neutrons

Explanation:

Hi, the atomic number of an element is equal to the number of protons it has.

For gold (Au): $Protons_{Au}=79$

If the atom is uncharged (and only if it is uncharged), the number of electrons it has is equal to the number of protons.

For gold (Au): $Electrons_{Au}=79$

At last, the atomic mass represents the protons plus the neutrons an atom has in its core. So:

$Neutrons_{Au} + Protons_{Au}=197$

$Neutrons_{Au}=197 - 79$

$Neutrons_{Au}=118$