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It is 1.
It typically has a +1 charge.
Beryllium has a +2 oxidation state, while Magnesium also has +2.
It is approximately 12.011.
It generally increases.
It is +2 and +3.
They have a full valence shell.
It is 1s² 2s² 2p⁶ 3s¹.
Helium is denser than Hydrogen.
It is 356.73 K.
It can vary from -1 to +7.
It increases as you go down.
It is +3.
It is 29.76 °C.
Fluorine is more electronegative.
It is approximately 14.007.
Reactivity increases.
It is 1s² 2s² 2p⁶ 3s² 3p⁶.
It is +5.
They can form variable oxidation states.
It is 21.45 g/cm³.