Physical Science Atomic Structure and the Periodic Table

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?

• The number of valence electrons

• The location of valence electrons

• The number of neutrons

• The number of protons

Most metals are ______ at room temperature.

• solid

• liquid

• gas

Elements in each column or group have similar physical and chemial properties

• True

• False

Elements in the same _______ on the periodic table have the same number of valence electrons

• rows

• periods

• groups

How is the periodic table organized?

• By atomic number

• By the number of electrons

• By the weight of the atom

• Atomic periodicity

Describe the location of non-metals on the periodic table?

• Middle

• Upper left corner

• Lower left corner

• Upper right corner

Rutherford conducted his famous "Gold Foil" experiment to learn about atomic structure. The results of his experiment are illustrated in the image. What does the experiment tell you about the structure of an atom?

• The atom is very dense

• The atom is positively charged

• The atom is negatively charged

• The atom is mostly empty space

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NGSS.MS-PS1-1

This image is an example of a(n)

• Compound

• Atom

• Mixture

• Molecule

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NGSS.MS-PS1-1

Describe the relationship of the atoms shown above.

• The rearrangement of atoms is a chemical change

• Stability of the atoms in the molecule means a physical change.

• A change in state of matter from a liquid to gas is a physical change.

• A change in state of matter from solid to liquid is a chemical change

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which image(s) would be considered pure substances?

• III and V

• II and IV

• I and II

• V

Tags

NGSS.MS-PS1-1