What is the atomic number of the element shown here?
- 7.
- 3.
- 4.
Explanation from PART66Online
In this notation the number at the bottom left of the symbol is the atomic number, the number of protons in the nucleus, and the number at the top left is the mass number, protons plus neutrons. Here the atomic number is 3 and the mass number is 4, so the nucleus has 3 protons and 4 - 3 = 1 neutron. 7 is the two numbers added together, which has no meaning.
Z
zoom77 asked · 1 Jun 2017
i know that atomic number Z is up on the left
Community Comments (3)
M
Matas24
21 Jun 2017
error in test
Z
zoom77
22 Jun 2017
thank you
J
Jordi
14 Jun 2020
the atomic number is right as it is ,it is 3 in this picture.The atomic mass/neucleus number/mass number is 4 you have confused it guys.
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