Atoms, elements and compounds

The periodic table is organized in horizontal rows called...

• Groups

• Periods

• Families

• Chemical Symbols

The vertical columns of the periodic table are called...

• Periods

• Families

• Chemical Symbols

• Groups

Which of the following describes how elements are arranged in the periodic table?

• by decreasing atomic mass

• by increasing atomic number

• by chemical name

• by repeating atomic number

What is the atomic number?

• The number of protons in an element
• The number of neutrons in an element
• The number of protons and neutrons.
• The number of protons and electrons.

Tags

NGSS.MS-PS1-1

Atoms of different elements can join together in arrangements to produce various substances found on Earth. There are more than 100 known elements, like:

gold

iron

steal

titanium

Which best describes the elements in the table above?

• Most of these elements are metalloids.

• Most of these elements are metals.

• Most of these elements are noble gases.

• Most of these elements are nonmetals.

Nickel is an element. What is the smallest particle of nickel that has the same chemical properties of nickel?

• an atom of nickel

• a proton from a nickel atom

• an electron from a nickel atom

• an electron from a nickel atom

Tags

NGSS.MS-PS1-1

An atom consists mostly of empty space with...

• protons orbiting a dense nucleus made of electrons and neutrons

• electrons orbiting a dense nucleus made of protons and neutrons

• neutrons and protons orbiting a cloud of electrons

• electrons and protons orbiting a cloud of neutrons

Tags

NGSS.MS-PS1-1

The modern atomic theory has been modified from Dalton’s original atomic theory. Why was the original theory changed?

• 
  The new theory was based on the opinion of modern scientists.

• There was new evidence to support the modifications.

• The public no longer believed the original theory.

• Theories are replaced every 100 years.

Match the description of the behavior of the particles with the correct state of matter.

• gas

• the particles have lots of

  energy, so they can move fast and far away from one

  another

• liquid

• particles

  are close together and only vibrate in place

• solid

• particles have more energy and can

  move around.

Tags

NGSS.MS-PS1-4

Match the physical property with the state of matter

• solid to liquid

• Boiling point

• liquid to gas

• Freezing point

• liquid to solid

• Melting point

Tags

NGSS.MS-PS1-4