Valence Electrons and Ionic Compounds Explained

What is a group in the periodic table?

• A set of elements with the same atomic number

• A set of elements with different properties

• A column of elements

• A row of elements

Why do elements in the same group have similar properties?

• They have the same atomic number

• They have the same number of valence electrons

• They are in the same period

• They have the same mass

What is the octet rule?

• Atoms are stable with 8 electrons in their outer shell

• Atoms are stable with 8 neutrons

• Atoms are stable with 8 valence electrons

• Atoms are stable with 8 protons

Why are noble gases unreactive?

• They have a full inner shell of electrons

• They have no electrons

• They have a full outer shell of electrons

• They have an odd number of electrons

How many valence electrons do halogens have?

• 5

• 6

• 7

• 8

What type of ion do halogens typically form?

• Positive ion

• Negative ion

• Neutral atom

• Cation

What is the common charge of ions formed by alkali metals?

• +1

• -2

• +2

• -1

Why is hydrogen an exception among alkali metals?

• It can gain or lose one electron to achieve a full outer shell

• It forms a negative ion

• It has two valence electrons

• It is a noble gas

What happens when an alkali metal reacts with a halogen?

• They form an ionic compound

• They form a covalent bond

• They do not react

• They form a metallic bond

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the formula for the ionic compound formed between calcium and iodine?

• CaI

• CaI2

• Ca2I2

• Ca2I