Question

1. what is the group number for each of the following groups; a. noble gasses b. alkaline earth metals c. halogens d. transition metals e. alkali metals 2. name 2 noble gasses. 3. name 3 alkali metals. 4. name 2 transition metals in period 4. 5. what is the term for the rows going across the periodic table? what is similar for all atoms in the same row?

Explanation:

1. a. Noble gases are in group 18 of the periodic table. They are known for their low reactivity.

b. Alkaline - earth metals are in group 2, characterized by having 2 valence electrons.
c. Halogens are in group 17 and are highly reactive non - metals.
d. Transition metals are in groups 3 - 12, having partially filled d - orbitals.
e. Alkali metals are in group 1, very reactive metals with 1 valence electron.

1. Two noble gases are helium (He) and neon (Ne). They have full outer electron shells, making them stable.
2. Three alkali metals are lithium (Li), sodium (Na), and potassium (K). They are soft, silvery - white, and highly reactive.
3. Two transition metals in period 4 are scandium (Sc) and titanium (Ti). They show variable oxidation states.
4. The rows going across the periodic table are called periods. All atoms in the same row have the same number of electron shells.

Answer:

1. a. Group 18

b. Group 2
c. Group 17
d. Groups 3 - 12
e. Group 1

1. Helium, Neon
2. Lithium, Sodium, Potassium
3. Scandium, Titanium
4. Periods; Same number of electron shells