Unit 1.1 Explore Reading check

A sodium atom has 11 electrons. If the sodium atom loses one electron, how many total energy levels will it have?

• 1

• 2

• 3

• 4

Which group of elements is most likely to lose electrons to become cations?

• Alkali Metals

• Boron Group

• Halogen

• Transition Metal

If an unchanged atom with three electrons loses one electron, what is the net charge on the resulting ion ?

• The net charge is +1
• The net charge is -1
• The net charge is -4

• The net charge is +4

Magnesium ( a metal) and oxygen (a nonmetal) combine to form magnesium oxide( MgO ). The atoms are held together by strong elctrostatic attractions between the positibe and negative charges from the atoms. Which type of bond holds these atoms together ?

• covalent

• hydrogen

• ionic

• polar covalent

Which of these regions of the periodic table will have the least reactive elements?

• Alkali Metals
• Transition Metals
• Noble Gases
• Alkaline Earth Metals

Which pairing will likely form an ionic bond ?

• Hydrogen and Oxygen
• Sodium and Chlorine
• Carbon and Hydrogen
• Nitrogen and Oxygen

suppose antom X and Y are electrically neutral. If atom X has two protons, and atom Y Has four Protons, what can you conclude about X and Y ?

• Atom X has more electrons than atom Y
• Atom X and Y have the same number of electrons
• Atom Y has more electrons than atom X
• Atom X and Y have the same number of protons

Which of the following is correct regarding the chemical bond between the hydrogen and oxygen atoms in a water molecule ?

• results in a unusally strong bond

• forms by a shared pair of electrons between hydrogenand oxygen

• results in a nonpolar molecule of water

• forms between the neutral the poles of hydrogen and oxygen

Of the groups of elements below, which are most likely to gain electrons to become anions

• Alkali Metal

• Boron Group

• Halogen

• Transition Metal

How many Naturally occuring elements are there ?

• 92

• 118

• 103

• 71