Questions: f for the elements below. Round all atomic masses to the nearest whole number: Element Symbol Atomic Number Atomic Mass # of Protons # of Electrons # of Neutrons sodium Cu silver calcium Pb radon

Solution Steps

First, we need to identify the correct symbols and atomic numbers for the elements listed in the table:

1. Sodium (Na) - Atomic number 11
2. Copper (Cu) - Atomic number 29
3. Silver (Ag) - Atomic number 47
4. Calcium (Ca) - Atomic number 20
5. Lead (Pb) - Atomic number 82
6. Radon (Rn) - Atomic number 86

Next, we round the atomic masses of these elements to the nearest whole number:

1. Sodium (Na) - Atomic mass ≈ 23
2. Copper (Cu) - Atomic mass ≈ 64
3. Silver (Ag) - Atomic mass ≈ 108
4. Calcium (Ca) - Atomic mass ≈ 40
5. Lead (Pb) - Atomic mass ≈ 207
6. Radon (Rn) - Atomic mass ≈ 222

For each element, the number of protons is equal to the atomic number, and the number of electrons is equal to the number of protons (assuming the atom is neutral). The number of neutrons is calculated as the atomic mass minus the atomic number.

1. Sodium (Na):

   • Protons: 11
   • Electrons: 11
   • Neutrons: \(23 - 11 = 12\)

2. Copper (Cu):

   • Protons: 29
   • Electrons: 29
   • Neutrons: \(64 - 29 = 35\)

3. Silver (Ag):

   • Protons: 47
   • Electrons: 47
   • Neutrons: \(108 - 47 = 61\)

4. Calcium (Ca):

   • Protons: 20
   • Electrons: 20
   • Neutrons: \(40 - 20 = 20\)

5. Lead (Pb):

   • Protons: 82
   • Electrons: 82
   • Neutrons: \(207 - 82 = 125\)

6. Radon (Rn):

   • Protons: 86
   • Electrons: 86
   • Neutrons: \(222 - 86 = 136\)

Final Answer