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A covalent bond is a bond between 2 non metals or semi-metals.

Beryllium can form ionic compounds with nitrates forming Be(NO3)2

So no beryllium does not form only covalent bonds.

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BeS

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Radium

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It is an element, number 4 in the p.t. and mass of 9 a.m.u.

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Yes

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beryllium has 4 protons and helium has 2 protons

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The rise in ionisation energy is not regular. To explain this we must remember that the second shell of electrons is actually subdivided into 2s and 2p. The most easily removed electron in Boron is that in the 2p orbital, higher in energy than the 2s electrons in Beryllium. It therefore needs less energy for total removal than does the 2s electron of Boron. This outweighs the effect of the increased nuclear charge of Boron, which tends to make its outer electron harder to remove.

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Alkaline means "of or relating to an alkali".

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Beryllium has 2 outer shell electrons. Its full electronic configuration is:-

1s2, 2s2

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No, strontium is more reactive than beryllium.

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in the mountains of france and california

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Disperson forces only because it is not a polar compound.

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BeCl+AgN2+H2O----->BeN2+AgCl

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This element is calcium. It is in the second group.

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Beryllium is in the second group. It is an alkaline earth metal.

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No, they are in the group 2. Be,Mg,Ca are few examples.

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Alkaline earth metals have 2 valence electrons. They are in the second group.

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Barium has more energy levels. So it has lesser ionization energy.

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more reactive

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BeF2 is non-polar as it is (strangely) covalent in nature and as such, the molecule has a linear shape which produces a non-polar molecule.

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Yes, they do. Actually, they react violently when heated and in the presence of oxygen.

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Yes, alkali metals are more reactive than alkaline-earth metals. All atoms want to have 8 electrons in their outer shells. Alkali metals have to give one electron away, where as alkaline-earth metals need to give two away which is less energetically favorable.

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The p orbital is slightly higher in energy than the s orbital. That why, it's easier to remove the 2p1 elecrtron from B, therefore the 1st ionisation energy in B will be lower

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Beryllium

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The reactivity of the alkaline earth metal is lower than that of the alkali metal.