- For 7Li+: Protons = 3, Neutrons = 4, Electrons = 2.
- For 3He: Protons = 2, Neutrons = 1, Electrons = 2.
- For 14C: Protons = 6, Neutrons = 8, Electrons = 6.
In the table provided, we need to fill in the missing information for the protons, neutrons, and electrons of the given symbols. Let's go through each symbol one by one:
1. Symbol: 7Li+
Protons: The atomic number of an element represents the number of protons. Since the symbol is Li, which stands for lithium, we know that lithium has an atomic number of 3. Therefore, the number of protons is 3.
Neutrons: To find the number of neutrons, we subtract the atomic number (protons) from the mass number. However, the mass number is missing in this case. Since lithium is typically represented as Li-7, we can assume that the mass number is 7. Therefore, the number of neutrons is 7 - 3 = 4.
Electrons: In a neutral atom, the number of electrons is equal to the number of protons. Since Li+ indicates a positive ion, it means that it has lost one electron. Therefore, the number of electrons is 3 - 1 = 2.
2. Symbol: 3He
Protons: The atomic number of helium is 2. Therefore, the number of protons is 2.
Neutrons: The mass number of helium is 3. Since the atomic number is 2, we subtract 2 from 3 to find the number of neutrons. Therefore, the number of neutrons is 1.
Electrons: In a neutral atom, the number of electrons is equal to the number of protons. Therefore, the number of electrons is also 2.
3. Symbol: 14C
Protons: The atomic number of carbon is 6. Therefore, the number of protons is 6.
Neutrons: The mass number of carbon is 14. Since the atomic number is 6, we subtract 6 from 14 to find the number of neutrons. Therefore, the number of neutrons is 8.
Electrons: In a neutral atom, the number of electrons is equal to the number of protons. Therefore, the number of electrons is also 6.