3M4 Chem Coursework 1

What charge does an atom have when it GAINS electrons?

• Positive

• Negative

• Neutral

• Combined charge

Which particles change the charge in atoms when ions are formed?

• Atoms

• Protons

• Electrons

• Neutrons

Which of the following formulae is a representation of an ion?

• Li

• O^2-

• Na-23

• F

What is the charge on a lithium atom that loses 1 electron?

• 1+

• +2

• 1-

• 2-

An atom has an electron configuration of 2, 8, 2.

What will be the electron configuration if it becomes stable?

• 2, 8, 2

• 2, 8, 8

• 2, 8

• 2, 8, 1

Why are ions formed?

• To make our lives difficult

• Because atoms want to be stable

• Because atoms have the same number of protons and electrons

• Because atoms gained neutrons

If an element has 3 outermost electrons, what charge will its ion most likely have?

• 3+

• 5+

• 3-

• 5-

The formula for sodium carbonate is Na₂CO₃. How many carbon atoms are in sodium carbonate?

• 1

• 2

• 3

• 4

Sodium hydroxide contains 1 sodium atom, 1 oxygen atom and 1 hydrogen atom. What is the formula for sodium hydroxide?

• NaOH3

• 1Na1O1H

• NaOH

• NHO

Which of the following diagrams shows a stable atom?

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