Question

fQuestion 1
Fill in the blanks: (5 marks)
1. The process in which a solid directly changes into a gas is called……..
2. The number of valence electrons present in magnesium is………..
3. Isotopes are species having the……….. atomic number but……… mass number.
4. When cooling is done, the kinetic energy……… and space between particles………
5. Change in the state of matter is caused by……… and………​

Answer 1

Answer:

1.) Sublimation

2.) 2

3.) same atomic number but different mass number.

4.) decreases and space between particles decreases.

5.) increase and decrease in temperature