Question

learning check

1. draw a simple outline of the periodic table. use shading to identify where the metals and the non - metals are.
2. name the group of elements that is not reactive. what feature makes the elements in this group not reactive?
3. name the element in each pair that is more reactive, and explain how you know.

a) k and na b) f and cl c) na and mg d) s and cl

1. using figure 2.7 as a guide, sketch the cells for the elements potassium and calcium. your sketch must show the chemical symbol and the electron shells with their electrons.

Explanation:

1.

Draw a rectangular grid representing the periodic - table layout. Shade the left - hand and middle sections for metals and the right - hand section for non - metals.

The noble gases (Group 18) are non - reactive. They have a full outer electron shell, which gives them a stable electron configuration.

a) Potassium (K) is more reactive than sodium (Na) because as you go down Group 1, the outermost electron is further from the nucleus and easier to lose.
b) Fluorine (F) is more reactive than chlorine (Cl) because as you go up Group 17, the atom is smaller and can attract an electron more strongly.
c) Sodium (Na) is more reactive than magnesium (Mg) because Na has only one electron in its outer shell and wants to lose it more easily than Mg which has two outer electrons.
d) Chlorine (Cl) is more reactive than sulfur (S) because Cl needs one electron to complete its outer shell while S needs two, and Cl has a higher electronegativity.

Answer:

A simple outline of the periodic table with appropriate shading for metals and non - metals as described above.

2.