Question

1. an atom of silicon with 15 neutrons.

○ element name:

○ protons:

○ neutrons:

○ electrons:

1. an atom with 79 protons and 118 neutrons.

○ element name:

○ protons:

○ neutrons:

○ electrons:

1. which of the following best defines an isotope?

a) atoms of different elements with the same number of neutrons.
b) atoms of the same element with the same number of protons but a different number of neutrons.
c) atoms of the same element with the same number of neutrons but a different number of protons.
d) atoms with the same mass number but different atomic numbers.

Explanation:

Step1: Identify element name for silicon

Silicon is the element name.

Step2: Determine number of protons for silicon

Silicon has an atomic number of 14, so protons = 14.

Step3: Given number of neutrons for silicon

Neutrons = 15 (given).

Step4: Calculate number of electrons for silicon

In a neutral atom, electrons = protons, so electrons = 14.

Step5: Identify element name for atom with 79 protons

The element with 79 protons is gold.

Step6: Determine number of protons for gold

Protons = 79 (given).

Step7: Given number of neutrons for gold

Neutrons = 118 (given).

Step8: Calculate number of electrons for gold

In a neutral atom, electrons = protons, so electrons = 79.

Step9: Define isotope

Isotopes are atoms of the same element with the same number of protons but a different number of neutrons.

Answer:

1. Element Name: Silicon

Protons: 14
Neutrons: 15
Electrons: 14

1. Element Name: Gold

Protons: 79
Neutrons: 118
Electrons: 79

1. B. Atoms of the same element with the same number of protons but a different number of neutrons.