Question

elements in the same period
a have the same properties.
b have similar properties
c have the non - metals on the right side
d have the same size atom

Explanation:

• Option A: Elements in the same period do not have the same properties. For example, in period 3, sodium (a metal) and chlorine (a non - metal) have very different chemical and physical properties.
• Option B: Similar properties are a characteristic of elements in the same group (vertical column), not the same period (horizontal row).
• Option C: In the periodic table, for a given period, as we move from left to right, the metallic character decreases and non - metallic character increases. So, non - metals are on the right side of a period.
• Option D: Atomic size generally decreases from left to right across a period due to an increase in nuclear charge which pulls the electrons closer to the nucleus.

Answer:

C. Have the non - metals on the right side