STAAR REVIEW

Which elements can conduct electricity?

• Gas

• Metal

• Non Metal

How do you determine the number of Protons of an element?

• Subtract the Atomic number from the Atomic mass

• It is the atomic mass

• It is the atomic number

How do you calculate the number of Neutrons?

• Atomic mass - Atomic number

• Just the atomic number

• Just the mass number

What element does this atom represent?

• Carbon (C)
• Magnesium (Mg)
• Sulfur (S)

Which element are non-reactive gas?

• Noble Gases

• Metals

• Metalloids

Which two atomic particles are found inside the center of an atom?

• Proton and Neutron
• Electron and Proton
• Electron and Neutron

What determine how reactive an element is?

• The number of protons
• The number of neutrons
• The number of Valence electrons

Who has the same number of valence electrons as Lithium (Li)

• Potassium (K)
• Beryllium (Be)
• Neon (Ne)

If Beryllium has an atomic mass of 9, how many Neutrons does an atom of Beryllium (Be) have?

• 4
• 9
• 5

How many Oxygen (O) atoms are in this formula?

• 4
• 1
• 8