Unit 3 - Atoms & Periodic Table

If you know the atomic number of an element and the element's position in the periodic table, what can you determine about the element?

• the atomic mass of the element
• the number of neutrons in an atom of the element
• the mass number of any element to the left or right of the element
• the atomic number of any element to the left or to the right of the element

Tags

NGSS.HS-PS1-1

A magnet attracts a piece of metal. How is this event like a chemical bond?

• A chemical bond is an interaction that always involves a metal.
• A chemical bond is an interaction that holds two atoms together.
• In a chemical bond, the substances that come together do not change.
• In a chemical bond, the substances that come together can be physically pulled apart.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

How do most ionic compounds compare with covalent compounds?

• Ionic compounds have higher melting and boiling points.
• Ionic compounds can generally be reshaped without breaking.
• Ionic compounds are more likely to be liquids at room temperature.
• Ionic compounds are good insulators of thermal and electrical energy in water.

What do elements in the same group on the periodic table have in common?

• They have the same atomic number.
• They have similar chemical symbols.
• They have similar chemical properties.
• They have the same average atomic mass.

Water is made up of units called molecules. Which description best defines a molecule?

• an atom that has gained or lost electrons
• a solid ionic compound formed from a three-dimensional pattern
• an attraction between positively charged metal ions and free electrons
• a group of atoms, usually belonging to nonmetals, joined by covalent bonds

Which of these is the smallest particle to retain the properties of an element?

• an atom
• a proton
• a molecule
• an electron

The periodic table of the elements is divided by a line that zigzags along the right side. Which of the following is true for most of the elements that lie along the zigzag line?

• They are metals.
• They are metalloids.
• They are nonmetals.
• They are transition metals.

An atom's mass number is 210 and its atomic number is 85. How many neutrons does the atom have?

• 85
• 125
• 210
• 295

Think about a wooden chair and a balloon. What do these two objects always have in common?

• Both are made of atoms.
• Both have the same mass number.
• Both are made of the same kind of atom.
• Both are made of the same number of atoms.

Tags

NGSS.MS-PS1-1

Which of the following scientists added negatively-charged particles to the model of the atom?

• Niels Bohr
• John Dalton
• Ernest Rutherford
• J. J. Thomson