Question 1

Which of the following elements has the highest electronegativity according to the Pauling scale?

Accepted Answer

Fluorine. Fluorine is the most electronegative element in the periodic table. It has a value of approximately 4.0 on the Pauling scale. This property makes it highly reactive with almost all other elements.

Question 2

What happens to the atomic radius as you move from left to right across a period?

Accepted Answer

It decreases. The atomic radius decreases across a period due to an increase in nuclear charge. As more protons are added, the nucleus pulls the electrons closer. This result leads to a more compact atomic size.

Question 3

Which group of elements is known as the 'Chalcogens'?

Accepted Answer

Group 16. Group 16 elements are collectively referred to as the Chalcogens. This group includes oxygen, sulfur, selenium, tellurium, and polonium. Most of these elements are found in copper ores.

Question 4

Which of the following is the most metallic element in the periodic table?

Accepted Answer

Francium. Francium is considered the most metallic element because it loses its valence electron most easily. Metallic character generally increases as you move down a group. It is a highly radioactive and rare alkali metal.

Question 5

The vertical columns in the modern periodic table are called?

Accepted Answer

Groups. The vertical columns are known as groups or families. There are 18 groups in the standard modern periodic table. Elements in the same group share similar chemical properties.

Periodic Trends — Set 1