This is the electron configuration for what element? 1s2 2s2 2p6 3s2 3p4

What comes after 7s?

How many protons does Bromine - 79 have?

How many neutrons does Barium - 138 have?

The top left number of the nuclear symbol is the

How many valence electrons does Gallium have?

How many valence electrons does Cesium have?

How many valence electrons does Helium have?

How many protons does Titanium - 47 have?

The number in the bottom left of the nuclear symbol is the

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