Question

of electrons = 35

5
b
10.81
atomic # =
atomic mass =
mass number =

of protons =

of neutrons =

of electrons =

Explanation:

Step1: Identify atomic number

The atomic number is the number above the element symbol. For boron (B), the atomic number is 5.
Atomic # = 5

Step2: Identify atomic mass

The atomic mass is the number below the element symbol. For boron, the atomic mass is 10.81.
Atomic Mass = 10.81

Step3: Determine mass number

The mass - number is the sum of protons and neutrons and is usually a whole number. Since the atomic mass is 10.81 (a weighted average of isotopes), we can approximate the most common isotope's mass number. Boron has two stable isotopes, and the most common one has a mass number of 11.
Mass Number = 11

Step4: Determine number of protons

The number of protons is equal to the atomic number. So, for boron, the number of protons is 5.

of Protons = 5

Step5: Calculate number of neutrons

The number of neutrons is the mass number minus the number of protons. So, 11 - 5=6.

of Neutrons = 6

Step6: Determine number of electrons

In a neutral atom, the number of electrons is equal to the number of protons. So, for boron, the number of electrons is 5.

of Electrons = 5

Answer:

Atomic # = 5
Atomic Mass = 10.81
Mass Number = 11

of Protons = 5

of Neutrons = 6

of Electrons = 5