Atoms and the PT

What is the atomic number of Carbon?

• 6

• 12.011

• 6.011

• Not enough information is given

How are elements in the same group similar?

• They have the same number of protons

• They are all the same size

• They share similar properties

• They have the same number of isotopes

What is the smallest piece of matter in the water particle?

• cell

• atom

• molecule

• compound

The diagram represents

• an atom of carbon dioxide and an atom of argon

• a molecule of carbon dioxide and an atom of argon

• an atom of carbon dioxide and a molecule of argon

• a molecule of carbon dioxide and a molecule of argon

The diagram represents

• atoms of hydrogen

• mixtures of hydrogen

• molecules of hydrogen

• compounds of hydrogen

How many atoms of chlorine are in a molecule of PCl₃?

• 1

• 2

• 3

• 4

What are the components of the formula CaCO₃? (Select all that apply)

• 1 calcium atom

• 3 carbon atoms

• 1 carbon atom

• 3 oxygen atoms

• 3 carbon atoms

Which atom is shown in the diagram? (Think about what tells each element apart)

• boron

• carbon

• nitrogen

• beryllium

The diagram shows a model of a Nitrogen (N) atom that Leslie drew. Based on your knowledge of the periodic table, which mistake did Leslie make on her diagram?

• Nitrogen should have 8 protons instead of 6

• nitrogen should have 7 protons instead of 6

• nitrogen should have 6 electrons instead of 7

• nitrogen should have 8 electrons instead of 7

Which of the following is correct about atoms?

• People can see atoms with their naked eye

• People can only see atoms with magnification

• Only solid materials that are made of atoms can be seen

• Atoms that can be seen are made of cells in living beings