Question

① where is the location of helium, neon, and argon in the periodic table? ② where are the elements hydrogen,lithium, and sodium located? ③ which elements have complete outer shells? give the name and symbol for each. ④ how would you classify hydrogen? why? ⑤ elements that are non - lustrous and are poor conductors of electricity are classified as ______. ⑥ group 2 elements are known as ____. ⑦ ____ have properties of both metals and nonmetals. ⑧ nonmetals ____ electrons when they form ions. ⑨ the periodic table was first arranged by the scientist ____. ⑩ group 1 is also known as the ______ metals.

Explanation:

1. Helium, neon, and argon are noble - gases and located in Group 18 of the periodic table.
2. Hydrogen is in Group 1, Period 1; lithium is in Group 1, Period 2; sodium is in Group 1, Period 3. They are in Group 1 (alkali - metals group, though hydrogen has unique properties).
3. Noble gases have complete outer shells. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).
4. Hydrogen can be considered a non - metal. It has one valence electron and typically forms covalent bonds like non - metals. It can also act as a cation in some cases.
5. Non - metals are non - lustrous and poor conductors of electricity.
6. Group 2 elements are known as alkaline earth metals.
7. Metalloids have properties of both metals and nonmetals.
8. Nonmetals gain electrons when they form ions to achieve a stable electron configuration.
9. The periodic table was first arranged by Dmitri Mendeleev.
10. Group 1 is also known as the alkali metals.

Answer:

1. Group 18
2. Group 1
3. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn)
4. Non - metal; it has one valence electron and typically forms covalent bonds and can act as a cation in some cases
5. Non - metals
6. Alkaline earth metals
7. Metalloids
8. Gain
9. Dmitri Mendeleev
10. Alkali