It is easy to make stone by beating metals. Which property of the metal does it indicate?

What is the increase in the ratio of oxygen in a chemical reaction?

Horizontal columns are called in the Periodic table.

Isotopes of an element do not have ______.

Which of the following is not necessary for photosynthesis?

Which of the following is a non-metal?

The tendency to receive electrons is called-

If the pH value of a substance is lower than 7, it would be considered as–