Chlorine ( Cl) has _________ valence electrons.

What are valence electrons?

All atoms are most stable with (or would "prefer") how many electrons in their valence shell?

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

Elements can have the same number of protons

An atom with atomic number 6 would have how many protons?

What element is represented in this Bohr Model?

What element contains 7 protons and 5 valence electrons?

Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below.

Which student’s responses are correct?

The vertical (up and down) columns in the Periodic Table are called

Elements in a .................. have similar chemical properties.

Find an element with similar chemical properties to Barium (Ba).