Question

1. multiple choice which of the following elements is in the same group as sodium (na)?

a. oxygen (o)
b. potassium (k)
c. neon (ne)
d. carbon (c)

1. short answer what do elements in the same group of the periodic table have in common?
2. multiple choice why do elements in the same group often react similarly?

a. they have the same atomic number
b. they are all metals
c. they have the same number of valence electrons
d. they are in the same period

1. short answer compare the chemical properties of chlorine (cl) and iodine (i). why are they similar?
2. short answer you wanted to conduct an experiment with sodium (na) and water, but you ran out of sodium. which element could you use in place of sodium that would react the same way. explain.

Explanation:

1.

Sodium is in Group 1 of the periodic table. Potassium is also in Group 1. Oxygen is in Group 16, Neon in Group 18 and Carbon in Group 14.

Elements in the same group of the periodic table have the same number of valence electrons. This gives them similar chemical - bonding and reactivity characteristics.

The reactivity of an element is mainly determined by the number of valence electrons. Elements in the same group have the same number of valence electrons, so they often react similarly.

Answer:

B. Potassium (K)

2.