Name: _____________________________
Date: _________________ Per:
_____
Chemistry
Assessment #4: Models of the Atom PRACTICE
For each of the following questions or statements, select the most appropriate response and write its
letter on the answer line:
_____ 1.
Who was the first person to suggest the idea of electrons?
A. Atomos
B. Dalton
C. Democritus
D. Galileo
E. Thomson
_____ 2.
Which of the following is a part of Dalton's atomic theory?
A. Atoms are almost always in motion.
B. All elements are composed of molecules.
C. Atoms can combine with other atoms to form elements.
D. Atoms of the same element are alike in mass and size.
_____ 3.
What particles form the outside of an atom?
A. electrons only
B. neutrons and electrons
C. protons and electrons
D. protons and neutrons
E. none of the above
_____ 4.
Which of the following models of the atom best describes Dalton's theories?
A. a model in which the atom is a solid sphere
B. a model in which the protons, electrons, and neutrons are evenly distributed throughout
the volume of the atom
C. a model in which the nucleus is made of protons, electrons, and neutrons
D. a model in which the nucleus is made of electrons and protons.
E. a model in which the region outside the nucleus is largely empty space in which the
electrons are situated
_____ 5.
Which scientist proposed the idea of the 'nucleus' after the unexpected results of his
students’ gold foil experiment?
A. Bohr
B. Dalton
C. Schrödinger
D. Rutherford
E. Thomson
_____ 6.
Isotopes of the same element have different:
A. positions on the periodic table
B. chemical behavior
C. atomic numbers
D. mass numbers
E. symbols
_____ 7.
The comparison of the number of atoms in a copper coin the size of a penny with the
number of people on earth is made to illustrate which of the following?
A. that atoms are indivisible
B. that atoms are very small
C. that atoms are very large
D. in a copper penny, there is one atom for every person on earth
E. there are fewer atoms in a copper penny than there are people on earth
_____ 8.
Which of the following statements about subatomic particles is correct?
A. Electrons are negatively charged and are the heaviest subatomic particle.
B. Protons are positively charged and the lightest subatomic particle.
C. Neutrons have no charge and are the lightest subatomic particle.
D. The mass of a neutron nearly equals the mass of a proton.
E. Electrons, protons, and neutrons all have the same mass.
_____ 9.
The nucleus of an atom is:
A. positively charged and has a high density
B. positively charged and has a low density
C. negatively charged and has a high density
D. negatively charged and has a low density
_____ 10. Which of the following discoveries led to the development of the quantum mechanical
model?
A. electrons occupied different energy levels around the nucleus
B. most alpha particles passed through gold foil without hitting matter
C. cathode rays could be bent by a magnetic field
D. atoms of gases combined to form compounds in whole-number ratios
Answers:
1. E
2. D
3. A
4. A
5. D
6. D
7. B
8. D
9. A
10. A