QUESTIONS FROM Science (ATOM)

 1.What is the smallest unit of an element that retains its chemical properties?

Answer: Atom

2.Who first proposed the atomic theory?

Answer: John Dalton

3.What are the three main particles that make up an atom?

Answer: Proton, neutron, and electron

4.What is the number of protons in the nucleus of a hydrogen atom?

Answer: 1

5.What is the force that holds the nucleus of an atom together?

Answer: The strong nuclear force

6.What is the name given to the electrons that occupy the outermost shell of an atom?

Answer: Valence electrons

7.What is the number of electrons in the outermost shell of a neutral nitrogen atom?

Answer: 5

8.What is the process by which one element is transformed into another through changes in the number of protons in its nucleus?

Answer: Nuclear reactions or nuclear decay

9.What is the principle that states that the electrons in an atom occupy specific energy levels or orbitals around the nucleus?

Answer: The quantum mechanical model or the electron configuration

10.What is the term used to describe the number of protons in an atom's nucleus?

Answer: Atomic number