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In Flourine-19, you can determine that the number of Neutrons is 10.

Now, if you look at Neon-20, you subtract its mass by the number of protons, leaving you with 10.

Therefore, Neon-20 has the same number of neutrons as Flourine-19.

Answer:

Neon is the elements with same number of neutrons as of Fluorine.

Explanation:

Mass number of an element is the sum of atomic number of element and number of neutrons.

atomic number is number of protons.

The atomic number of given elements are

Neon: 10

Oxygen: 8

Sodium: 11

Nitrogen: 7

Fluorine: 9

The number of neutrons will be

Fluorine-19

Number of neutrons =19-9=10

Neon-20 :

Number of neutrons = 20-10 = 10

Oxygen-19:

Number of neutrons = 19-8 = 11

Sodium-22

Number of neutrons = 22-11 = 11

Nitrogen-16

Number of neutrons = 16-7 = 9

thus Neon is the elements with same number of neutrons as of Fluorine.

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