Atomic Structure & History

Front

What did Bohr propose about electron movement?

Back

Electrons move around the nucleus in specific layers, or shells.

Front

Which atomic model is represented by Thomson's experiment?

Back

Thomson's atomic model.

Front

How many protons does the element with atomic number 7 have?

Back

7 protons.

Front

What are the conclusions of Rutherford’s gold foil experiment?

Back

1. Atom is mostly empty space. 2. The nucleus is positively charged. 3. The atom has a small dense nucleus. (All answers are correct.)

Front

How many protons are in one atom of Lithium?

Back

3 protons.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the nucleus in an atom?

Back

The nucleus contains protons and neutrons, making it the dense center of the atom.

Front

Who discovered the electron?

Back

J.J. Thomson.

Front

What is Dalton's atomic theory?

Back

1. All matter is made of atoms. 2. Atoms are indivisible and indestructible. 3. Compounds are formed by a combination of two or more different kinds of atoms.

Front

What is the charge of a proton?

Back

Positive charge.