help please

1/ if the electron is 10 what is the electron configuration, protons, neutron, mass number, group, period

2/ if protons are 15 and neutrons are 16 what is the electron, electron cinfiguration, mass number, group, period

3/ if the electron configuration is 2:8:3 and the mass number is 27 what is the elctron, proton, neutron, group, period

4/ if the neutrons are 18 and the group is 17 the period 3 what is the electron, electron configuration, proton, mass number


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The number of electrons is the same as the number of protons (in neutral atom) and with the atomic number (which you can see in the periodic table). So:

1/ It is neon; 10 electrons, protons and nutrons. Electronic configuration is 1s2, 2s2, 2p6

2/It is phosphorus; 15 electrons, configuration 1s2, 2s2, 2p6, 3s2, 3p3. Group 15, period 3. Ar=30.97.

3/Aluminium; 13 protons and electrons and 14 protons, group 13, period 3

4/Chlorine, Ar=35.45, 17 electrons and protons, configuration 1s2, 2s2, 2p6, 3s2, 3p5

You should learn how to use the periodic table. :)

WebElements: the periodic table on the WWW []

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