4.3 Periodic Table

I'm an atom with 5 energy levels. I'm a metal in the mixed groups. I have 5 valence electrons. What element am I?

• bismuth

• polonium

• lead

• antimony

I am a nonmetal that exists in the same period as neon. I have 7 valence electrons. What element am I?

• fluorine

• chlorine

• oxygen

• nitrogen

I am a noble gas with the lowest atomic number. What element am I?

• argon

• helium

• neon

• krypton

I am a transition metal with 25 electrons in a neutral atom. What element am I?

• iron

• manganese

• nickel

• cobalt

What is a valence electron?

• electron in the outermost energy level of an atom

• electron in the innermost energy level of an atom

• any electron in an atom that gains and loses energy

• the last electron that gets added to the atom's Bohr model