PERIODIC TABLE

Mendeleev arranged the known elements according to increasing atomic

Which element is found only in compounds in nature?

The usefulness of Mendeleev's periodic table was confirmed by

Which statement is true about the metalloid silicon?

Which general statement does not apply to metals?

Moving from left to right across a row, what increases exactly by one

The atomic mass of an element is

What is a period on the periodic table?

Which of the following Halogens is the most reactive?

A period is a column.

What is not true about F, Cl and I?

What are valence electrons?

Two highly reactive elements in period 2 are the metal lithium and

In a periodic table, a set of properties repeat from

Which of the following gases emit color when electric current is applied?

The tendency of an element to react is closely related to

Why are elements grouped together on the periodic table?

Which list contains only metals?

At room temperature, none of the metals are

Which one is the most reactive of the Alkali metals?

Atoms of the most reactive elements tend to have

Which element is found in most compounds in your body except for water?

Boron family has 3 valence electrons, while N group has

Group 17 contains the