Question

which group is known to commonly bond with group 17 (halogens)?*
○ noble gases
○ transition metals
○ alkali metals
○ carbon family

how many electron are in a neutral element of calcium?*
○ 20
○ 19
○ 21
○ 22

how many valence electrons do elements in group 2 (alkaline earth metals) have?
○ 1
○ 2
○ 3

Explanation:

First Question: Which group is known to commonly bond with Group 17 (Halogens)?

Halogens (Group 17) have 7 valence electrons and tend to gain 1 electron to achieve a stable octet. Alkali Metals (Group 1) have 1 valence electron and tend to lose that 1 electron. The transfer of this electron from an alkali metal to a halogen allows both to achieve stable electron configurations, leading to ionic bonding. Noble Gases are stable and don't typically bond. Transition Metals have variable valence and don't commonly bond with halogens in the same consistent way as alkali metals. The Carbon Family has 4 valence electrons and doesn't have the same electron - transfer relationship with halogens as alkali metals.

Step 1: Recall the relationship in a neutral atom

In a neutral atom, the number of electrons is equal to the number of protons (atomic number).

Step 2: Find the atomic number of Calcium

The atomic number of Calcium (Ca) is 20. So, the number of electrons in a neutral Calcium atom is equal to its atomic number, which is 20.

The group number of main - group elements (excluding transition metals) indicates the number of valence electrons. Elements in Group 2 are main - group elements, so they have 2 valence electrons.

Answer:

C. Alkali Metals

Second Question: How many electrons are in a neutral element of Calcium?