Exploring Isotopes and Ions

What does the standard form of an element on the periodic table represent?

• An element with a different number of electrons

• The most common form of the element

• An element with a different number of protons

• An element with a different number of neutrons

What changes in an isotope of an element?

• Atomic number

• Number of neutrons

• Number of electrons

• Number of protons

How is an isotope of an element written differently from its standard form?

• Elemental symbol followed by a dash and the new atomic number

• Elemental symbol followed by a dash and the new atomic mass number

• Elemental symbol followed by a dash and the new number of protons

• Elemental symbol followed by a dash and the new number of electrons

Why can isotopes be dangerous?

• They emit subatomic particles

• They change the atomic number

• They have fewer electrons than usual

• They have more protons than usual

What is the most common isotope of carbon found on Earth?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15

What is an ion?

• An atom that has acquired a full charge

• An atom with a different number of neutrons

• An atom with a different atomic number

• An atom with a different number of protons

What is a cation?

• An ion with a negative charge

• An ion with an extra neutron

• An ion with a positive charge

• An ion with no charge

Why do elements become ions?

• To lose protons

• To increase their mass

• To become stable

• To change their atomic number

How does sodium achieve stability?

• By gaining a neutron

• By losing an electron

• By losing a proton

• By gaining an electron

What charge does oxygen acquire when it gains two electrons?

• One positive

• Two positive

• One negative

• Two negative