Question
How many neutrons does fluorine have?
- 9
- 19
- 10
- 18
Hint:
atomic mass = number of protons + number of neutrons.
The correct answer is: 10
Atomic number = number of protons, atomic mass = number of protons + number of neutrons.
Atomic number of fluorine is 9 and atomic mass is 18.998 which is almost equal to 19. Therefore, number of neutrons is 10.
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How many shells are present in potassium?
The region surrounding a nucleus, known as an electron shell, is where electrons are typically located.
¶1s, 2s, 2p, 3s, 3d, 4p, 5s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and 8s are the numbers in order. Although it is difficult to remember, there is a simple approach. Move from top to bottom, top right end to the bottom left of each line, in the order of the lines.
¶The lowest accessible shell nearest to the nucleus must be occupied by electrons.
¶The most electrons that can fit into each shell are:
¶There were two in the first shell, eight in the next, and eight in the last.
The twenty-first element, calcium, has two more electrons in the fourth shell.
How many shells are present in potassium?
The region surrounding a nucleus, known as an electron shell, is where electrons are typically located.
¶1s, 2s, 2p, 3s, 3d, 4p, 5s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and 8s are the numbers in order. Although it is difficult to remember, there is a simple approach. Move from top to bottom, top right end to the bottom left of each line, in the order of the lines.
¶The lowest accessible shell nearest to the nucleus must be occupied by electrons.
¶The most electrons that can fit into each shell are:
¶There were two in the first shell, eight in the next, and eight in the last.
The twenty-first element, calcium, has two more electrons in the fourth shell.
