Physical Science 4.1 & Element Builder Gizmo

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

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

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

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

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-

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?

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

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