Download Atoms Review worksheet

Name ___________________________________
Atoms
Matching
_____1. Proton
A. atoms of the same element with
different number of neutrons
_____2. Neutron
B. neutral particle with NO charge in the
nucleus of the atom
_____3. Electron
C. contains 99.9% of mass of the atom;
center of an atom
_____4. Nucleus
D. negatively charged particle in electron
shells of atom
_____5. Isotopes
E. positively charged particle in the nucleus
of the atom
Choose the best answer.
______6. The nucleus of the atom contains__________.
A. protons and electrons
B. electrons and neutrons
C. protons and neutrons
D. electrons only
_____7. Which particles have the same size and mass of each other?
A. protons and electrons
B. electrons and neutrons
C. protons and neutrons
D. None- each is different in size and mass
______8. Which two particles would be attracted to each other?
A. protons and electrons
B. electrons and neutrons
C. protons and neutrons
D. None of them
______9. The atomic number of an element is the same as the number of
__________that it has:
A. protons
B. neutrons
C. mass of protons and neutrons
D. mass of electrons
______10. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all
have in common?
A. They each identified new elements.
B. They each identified new isotopes of atoms.
C. They each contributed to the development of the atomic
theory.
D. They each conducted experiments in which particles collided
______11. An atom of gold with 79 protons, 79 electrons, and 118 neutrons
would have a mass number of
A. 39
B. 197
C. 158
D. 276
______12. How many protons does an atom with an atomic number of 10
and a mass number of 20.1797 have?
A. 10
B. 31
C. 11
D. 30
______13. Isotopes exist because atoms of the same element can have
different numbers of
A. protons
B. electrons
C. neutrons
D. None of the above
______14. The Greek philosopher who gave the atom its name was
A. Democritus
B. Dalton
C. Thomson
D. Rutherford
______15. A representation of an object or system is a(n)
A. theory
B. law
C. model
D. experiment
______16. The S.I. unit used to express the masses of particles in atoms is the
A. kilogram (kg)
B. Newton (N)
C. gram (g)
D. atomic mass unit (amu)
______17. The least massive particles of an atom are
A. protons
B. electrons
C. neutrons
D. Both (a) and (b)
______18. An atom becomes an ion when
A. there are equal numbers of protons and electrons.
B. there are equal numbers of protons, neutrons, and electrons.
C. there are unequal numbers of protons and electrons.
D. None of the above
______19. Protons push away from one another in the nucleus because of
___________.
A. gravitational force
B. strong force
C. electromagnet force
D. weak force
Complete the blank for the element below.
16
S
32.06
20. Atomic number________
21. Atomic mass__________
22. # of protons___________
23. # of neutrons__________
24. # of electrons__________
What is the name of the element in the drawing above? ________