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Norma-Jean [14]
3 years ago
12

An atom has a mass number of 9 and 5 neutrons. What is its atomic number? A 19 B. 14 O c.4 D. 11 SN​

Chemistry
2 answers:
nika2105 [10]3 years ago
5 0

Answer:

\boxed {\boxed {\sf C. \ 4}}

Explanation:

First, define some important terms.

  • Mass number: the sum of the nucleons (protons and neutrons)
  • Atomic number: the number of protons

We know the mass number is 9. So, the sum of protons and neutrons is 9.

  • mass \ number =9
  • protons + neutrons = 9

We also know the atoms has 5 neutrons. Therefore, the rest must be protons.

  • protons + 5 \ neutrons =9

Subtract the 5 neutrons from the overall mass number of 9.

  • protons = 9- 5 \ neutrons \\
  • protons=4

There are 4 protons, so the atomic number is also <u>4</u>. This atom is beryllium.

butalik [34]3 years ago
4 0

Answer:

C. 4

Explanation:

the mass is the number of neutrons and Protons. so if you have 5 neutrons that means the rest are Protons... and the number of Protons is the Atomic number meaning the Element number... Beryllium is the element :)

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