Question

a) What is periodicity in properties of elements with reference to the modern periodic table?
b) Why do all elements of the same group have similar properties?
c) How does the tendency of elements to gain electrons change as we move from left or right in a period?

Answer 1

Answer:

a) Repetition of properties in the modern periodic table after a certain interval is called periodicity of properties.

b) Because of similar electronic configuration.

c) Increases.

Hope it helps you

Answer 2

Answer:

Hey mate here's your answer.

Explanation:

According to the modern periodic law, the properties of an element are a periodic function of their atomic masses.

a)Periodicity is the phenomenon of the repetion in the properties of the elements due to no. of valence electrons in the valence shells.

b)All elements of the same group have same no. of valence electrons in their outermost shell, so they all have same chemical properties.

c)As we move from left to right in a period, the non-metallic character increases and as we know that metals lose electrons and non-metals gain electrons . Therefore,the tendency of elements to gain electrons increases as we move from left to right in a period.

Hope it helps you.

Please mark it as brainliest answer.