Mackillop College Chemistry Revision 2

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 neutrons

• 40 neutrons

• 22 neutrons

• 21.9 neutrons

Look at this picture of Argon off the periodic table. Which of the following is true for this element when it is neutral?

• 18 electrons

• 40 electrons

• 22 electrons

• 21.9 electrons

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

When you have an ion of an atom, O^-2 for example, what has changed in the atomic structure?

• Number of protons

• Number of neutrons

• Number of electrons

When you have a negative ion of an atom, O^-2 for example, do you have a higher number of protons or electrons?

• Number of protons

• Number of electrons

When you have a positive ion of an atom, Na⁺¹ for example, do you have a higher number of protons or electrons?

• Number of protons

• Number of electrons

What is the name of this element?

• Lithium
• Boron
• Carbon
• Neon

What is the mass number of this atom?

• 1
• 3
• 4
• 7

How many valence electrons?

• 2
• 3
• 5
• 10