Physical Science 4.1 & Element Builder Gizmo

Multiple Choice

Dalton’s theory did not include which of the following points?

• All elements are composed of atoms

• Most of an atom’s mass is in its nucleus

• Compounds contain atoms of more than one element

• In a specific compound, atoms of different elements always combine in the same way

Multiple Choice

J. J. Thomson’s experiments provided the first evidence of

• atoms

• a nucleus

• subatomic particles

• elements

Multiple Choice

The concept of an atom as a small particle of matter that cannot be divided was proposed by the ancient Greek philosopher, Democritus.

• True

• False

​Element Builder Gizmo Questions

Multiple Choice

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below?

⁷Li

• 2 neutrons

• 13 neutrons

• 4 neutrons

• 7 neutrons

Multiple Choice

The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below?

¹⁹F^1-

• 8 electrons

• 9 electrons

• 10 electrons

• 20 electrons

Multiple Choice

The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown. Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?

• ³⁵Cl^1-

• ³⁵Cl^2-

• ³⁵Cl¹⁺

• ³⁵Cl

Multiple Choice

An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?

• atomic number = 26, atomic mass = 56, net charge = 3+

• atomic number = 26, atomic mass = 56, net charge = 3-

• atomic number = 30, atomic mass = 56, net charge = 3+

• atomic number = 56, atomic mass = 26, net charge = 3-

Poll

A lithium atom contains 3 protons, 4 neutrons and 3 electrons. What would be formed if one proton is added to this atom?

• a lithium ion

• a different isotope of lithium

• a beryllium ion

• a neutral atom of beryllium