Question

5 b 10.81 atomic # = __ atomic mass = # of protons = # of neutrons = # of electrons = __

Explanation:

Step1: Determine Atomic Number

The atomic number (number of protons) is given by the bottom left number (or the number above the symbol in some periodic table representations). Here, the element is Boron (B) with atomic number 5. So, number of protons = 5.

Step2: Determine Atomic Mass

The atomic mass is given as 10.81 (usually rounded to whole number for neutron calculation, so 11).

Step3: Calculate Number of Neutrons

Number of neutrons = Atomic mass (rounded) - Atomic number. So, 11 - 5 = 6.

Step4: Determine Number of Electrons

In a neutral atom, number of electrons = number of protons. So, number of electrons = 5.

Answer:

• Atomic # (Protons) = 5
• Atomic Mass = 10.81 (or 11 for neutron calc)
• # of Protons = 5
• # of Neutrons = 6 (11 - 5)
• # of Electrons = 5