ch 12 atoms and atomic theory

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 are made of protons, neutrons and electrons

• the nucleus is the center of the atom

• atoms can join to form molecules

• atoms are constantly in motion

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Dalton's atomic theory was accepted because

• there was evidence to support it

• Democritus said that it was correct

• Dalton invented the electron microscope

• Dalton showed how molecules are formed

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Which statement is true according to Dalton's theory?

• Atoms of different elements can join to form larger atoms

• atoms can be subdivided into smaller particles

• atoms of the same element differ in electric charge

• atoms of the same element are exactly alike

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Which statement about the atomic nucleus is correct?

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

• The nucleus is made of electrons and has a negative charge

The charge of an electron is

• -2

• -1

• 0

• +1

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Atoms have no electric charge because they

• have an equal number of charged and noncharged particles

• have neutrons in their nuclei

• have an equal number of electrons and protons

• have an equal number of neutrons and protons

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

• planet's orbiting the sun

• waves on a vibrating string

• light energy in a vacuum

• planets rotating on their axes.

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

• electric charge

• atomic mass

• energy level

• speed

According to modern atomic theory, it is nearly impossible to determine an electron's exact

• color

• position

• charge

• mass

Ionization refers to the process of

• changing from one period to another

• losing or gaining protons

• turning lithium into fluorine

• losing or gaining electrons

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