give the number of protons, electrons, and neutrons in the following atoms a. 90Zr b. 202Hg c. 58Ni d.222Rn

To determine the number of protons, electrons, and neutrons in an atom, you need to use its atomic number (Z) and mass number (A). The atomic number gives you the number of protons, and the mass number gives you the sum of protons and neutrons. Electrons are assumed to be equal to the number of protons in a neutral atom.

Let's break down the information for each atom:

a. 90Zr (Zirconium):

• Atomic number (Z) = 90 (number of protons)
• Mass number (A) is not specified, so we don't have the exact number of neutrons. If you have the mass number, you can calculate the number of neutrons by subtracting the atomic number from the mass number.

b. 202Hg (Mercury):

• Atomic number (Z) = 80 (number of protons)
• Mass number (A) = 202
• Number of neutrons = A - Z = 202 - 80 = 122

c. 58Ni (Nickel):

• Atomic number (Z) = 28 (number of protons)
• Mass number (A) is not specified.

d. 222Rn (Radon):

• Atomic number (Z) = 86 (number of protons)
• Mass number (A) = 222
• Number of neutrons = A - Z = 222 - 86 = 136

If you have the mass number for atoms (a) and (c), you can calculate the number of neutrons using the formula: Number of neutrons = Mass number (A) - Atomic number (Z). Without the mass number, the information is incomplete.