Atoms and the Periodic Table

Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and

• Atoms can join to form molecules

• Atoms are constantly in motion

• The nucleus is the center of the atom.

Which statement about the atomic nucleus is correct?

• The nucleus is made up of protons and neutrons and has a negative charge.

• The nucleus is made of protons and neutrons and has a positive charge.

• The nucleus is made up of protons and has a negative charge.

The charge of an electron is

• -2

• -1

• +1

Atoms have no electrical charge because they

• have an equal number of charged and noncharged particles

• have an equal number of electrons an protons

• have an equal number of neutrons and protons

According to Bohr's model of the atom, electrons behave like

• planets orbiting the sun

• waves on a vibrating string

• light energy in a vacuum

According to Bohr's theory, an electron's path around the nucleus defines its

• atomic mass

• energy level

• speed

The order of elements in the periodic table is based on

• the number of protons in the nucleus

• the electric charge of the nucleus

• the number of neutrons in the nucleus

Atoms of elements that are in the same group have the same number of

• Protons

• Neutrons

• Valence Electrons

Oxygen's atomic number is 8. That means that an oxygen atom has

• A total of 8 protons and neutrons

• A total of 8 neutrons

• A total of 8 protons in its nucleus

Which statement about alkali-metals is correct?

• They are located in the left-most column of the periodic table

• They are extremely nonreactive

• They are usually gases