Structure of atom class 9 blank quiz hard

Class 9 Science - Structure of Atom Quiz

21. The particles that have no charge and are located in the nucleus of an atom are called ________.

22. The number of neutrons in the nucleus of an atom is equal to its ________ number minus its atomic number.

23. The total number of protons and neutrons in the nucleus of an atom is also known as its ________ mass.

24. Atoms of the same element with different numbers of neutrons are called ________.

25. The number of electron shells or energy levels in an atom is indicated by its ________ number.

26. The negatively charged particles that move around the nucleus of an atom are called ________.

27. The positively charged particles in the nucleus of an atom are called ________.

28. The atomic number of an element determines its ________ properties.

29. The atomic number of an element is equal to the number of ________ in its nucleus.

30. The total number of protons and neutrons in the nucleus of an atom is called its ________ number.