Unit 3 Atoms and the Periodic Table

Oxygen-18: How many protons does it have?

The number of these is the atomic number for the element

Has a change of 1+

How many electron shells, or energy levels does Cesium (#55) have?

Oxygen-18: What is the mass number (the atomic mass number)?

Which of the elements below has 2 valence electrons?

Oxygen-18: What is the atomic mass?

What element has 1 energy level and 2 valence electrons?

Determines the mass of an atom

Which of these isotopes has the fewest number of neutrons?

Isotopes of an element have atoms with different numbers of

Choose the correct statements about elements in Group 17

Determines the size of an atom

Choose the element that has 5 valence electrons and 2 energy levels.

If you remove a proton from the nucleus of a magnesium atom (#12), what remains is

Oxygen-18: What is the atomic number?

Hydrogen is classified with these elements.

These elements are usually gases at room temperature.

Oxygen-18: How many neutrons does it have?

Has a mass of 1/2000 amu

Is located in the nucleus

Elements in the periodic table are listed in order of atomic

Located outside the nucleus in a cloud

What element/isotope has an atomic number of 12 and an atomic mass number of 26.

Has a charge of 1-

Has a mass of 1 amu

Has no charge