Write the complete symbol, including mass number and atomic number, for each atom.

Question

contains 28 protons and 30 neutrons:

contains 22 protons and 21 neutrons:

contains 15 electrons and 19 neutrons

an oxygen atom with 10 neutrons:

a chromium atom with a mass number of 54:

Answer 1

Hi Bryan,

1. Atom with 28 protons and 30 neutrons is Nickel:
2. Symbol: Ni
3. Mass number: 58
4. Atomic number: 28
5. Atom with 22 protons and 21 neutrons is Titanium:
6. Symbol: Ti
7. Mass number: 43
8. Atomic number: 22
9. Atom with 15 electrons and 19 neutrons is Phosphorous:
10. Symbol: P
11. Mass number: 34
12. Atomic number: 15
13. Oxygen with 10 neutrons:
14. Symbol: O
15. Mass number: 18
16. Atomic number: 8
17. Chromium with mass number of 54:
18. Symbol: Cr
19. Mass number: 54
20. Atomic number: 24

Note that the atomic number = number of protons, number of protons = number of electrons, and mass number = protons + neutrons. To identify the symbol, you can use the atomic number to find it on the periodic table.

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