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Nana76 [90]
3 years ago
6

What is the number of neutrons in an atom with atomic mass of 35, three energy levels, and 7 valence electrons?

Chemistry
2 answers:
soldier1979 [14.2K]3 years ago
5 0

Answer: the number of Neutron = 18

Explanation:

Mass number =35

3 energy levels means 3 shells

1st shell = 2 electrons

2nd shell = 8 electrons

3rd shell = 7 electrons

Total = 17

Proton = 17

Neutron = Mass number — proton

Neutron = 35 — 17 = 18

zubka84 [21]3 years ago
4 0

Answer:

The answer to your question is 18 neutrons

Explanation:

Data

Number of neutrons = ?

Atomic mass = 35

Three energy levels

seven valence electrons

Process

1.- We know that this element is on the third period (3 energy levels)

2.- We also know that this element is located on group 7A (it is a halogen)

3.- From the previous information, we conclude that this element is Chlorine.

4.- Chlorine has an atomic number of 17.

5.- The number of Neutrons = Atomic mass  - atomic number

                                               = 35 - 17

                                              = 18

   

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If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

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