What determines the identity of an element?

In a neutral atom, protons and electrons have the same amount.

Sulfur has a mass of 32 and the atomic number of 16. How many neutrons does it have?

What determines the reactivity of an element?

The protons live inside of the electron cloud.

Protons and neutrons make up the mass of the atom.

If an atom has 34 electrons, what would the atomic number be?

If an element has an atomic number of 10 and 10 neutrons, what is the atomic mass of the element?

Which two elements will react in similar ways?

Periods go up and down.

Which way do periods go?

Which way do groups go?

What does the group number on the periodic table of elements tell us?

How many valence electrons does Selenium (Se) have?

Which two elements will have the same number of rings or shells in their electron clouds?

Which two groups are the most reactive?

Which group is non reactive?

An element is very malleable, conducts electricity, and is shiny. What group would this element be classified as?

Metalloids share the properties of metals and nonmetals.

This element is dull in color, breaks easily, and is an insulator. Which element below is most likely being described?

This element is shiny in color, bends easily, but is an insulator. Which element is most likely being described?

Beryllium (Be) and Calcium (Ca) will not react in similar ways.

Metals can have which of the following characteristics?

Nonmetals can have which of the following characteristics? Check all that apply.