Alkaline Earths

The outermost shell contains two electrons.

Magnesium is used both in making fireworks and medicines.

The alkaline metal with three rings would be magnesium(Mg). It has an atomic number of 12 and atomic mass if rounded is 24. Protons and eletrons are 12 (Electrons are always the same number as protons and the number of protons is the same as the atomic number)and Neutrons( found out by subtracting the atomic mass from the number of protons) is 12.

It would have 3 rings because there are 12 electrons. So, 2 electrons can be in the first orbit, 8 in the second, and 8 in the third. Basically you must fill up the first and second orbit and then in the third you have only 2.

Nothing, all the alkaline earth metals are in group 2.

Alkali metals: Group 1 in the periodic table

Alkaline earth metals: Group 2

Halogens: Group 17

Noble Gases: Group 18

You can easily find them if you look at a periodic table.

idk, why're you asking me?

you should've listened more in your chemistry class

tut tut

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.

less than 2 (1)

AM are in group one and are very reactive, unstable, and has one electron in the outer shell, where as in AEM they are in group two and have 2 electrons in the outer shell.

Aquamarine, emerald, alexandrite

Compound, no group 2 or group 1 (except H if its considered) exist in elemental form naturally.

Radium (Ra) Z = 88.

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.

At room temperature beryllium is a solid metal.

Beryllium is less dense and lightweight. it makes for better use as an alloy! =)

In old nomenclature, oxides of elements were called "earths". The oxides of Group II form alkaline (basic pH) solutions in water; i.e. they are base anhydrides. Thus they were referred to as the alkaline earth metals.

Cerium

2 Be + O2 = 2 BeO

None.

The alkaline earth metal isotope with the fewest neutrons would be beryllium-7 with three neutrons and a half-life of 53 days.

Beryllium is the first element in the alkaline earth metals.

Beryllium is a chemical element. It's used as a hardening agent in alloys. It's widely used in the aerospace industry. To find out all the details about beryllium, type in "beryllium" in your web browser and you'll get several websites describing it.

they are most reactive

Beryllium (Be)

0 and 2 oxidation states, and in some cases, 1 also

Beryllium (Be)

Melting points: 1560 K, 1287 °C, 2349 °F

Boiling points: 2742 K, 2469 °C, 4476 °F