How many electrons and neutrons are in Francium (Fr) (1 Point) 87 electrons, 136 neutrons 87 protons, 135 neutrons 88 electrons, 223 neutrons 87 electrons, 223 neutrons
The Correct Answer and Explanation is:
The correct answer is: 87 electrons, 136 neutrons.
Explanation:
- Electrons:
- Francium (Fr) has an atomic number of 87, which means it has 87 protons in its nucleus.
- In a neutral atom, the number of electrons is equal to the number of protons. Therefore, Francium has 87 electrons.
- Neutrons:
- The number of neutrons in an atom is calculated using the formula: Neutrons=Mass number−Atomic number\text{Neutrons} = \text{Mass number} – \text{Atomic number}Neutrons=Mass number−Atomic number
- The mass number of Francium is 223, which is the total number of protons and neutrons in the nucleus.
- Therefore, the number of neutrons in Francium is: Neutrons=223−87=136\text{Neutrons} = 223 – 87 = 136Neutrons=223−87=136
- So, Francium has 136 neutrons.
Summary:
- Francium has 87 electrons (equal to the atomic number).
- Francium has 136 neutrons, calculated by subtracting the atomic number from the mass number (223 – 87).
