Investigations 2 & 3 Review

O, Cl, Ar

Al, Si, P

Na, Mg, Al

Se, P, Si

The claim is incorrect because atomic radius generally increases down a group as energy levels are added.

The claim is correct because atomic radius always decreases down a group.

The claim is incorrect because sulfur has a larger atomic number than selenium.

The claim is correct because elements below sulfur have fewer occupied energy levels.

Na, because it is farthest left and its outer electron is generally easier to remove

Mg, because it has fewer protons than Ar

Ar, because noble gases always lose electrons most easily

Ar, because ionization energy decreases from left to right

The outermost shell corresponds to the atom’s highest energy level

The outermost shell always contains exactly two electrons

Electrons in outer shells have no energy

The nucleus is located outside the energy shells

It is most likely a metal because all three observations are characteristic metallic properties

It is most likely a noble gas because it is shiny

It is most likely a gas because it conducts electricity

It cannot be classified because physical properties provide no evidence

It has 14 protons.

It has 14 neutrons.

It has 4 core electrons.

It has 4 valence electrons.

The element is likely a Group 14 element.

The element must have exactly 14 protons.

The element must have exactly 14 neutrons.

The element is likely a noble gas like neon.

The claim is correct because Group 14 elements have 14 neutrons.

The claim is correct because Group 14 elements have 14 protons.

The claim is incorrect because Group 14 is characterized by four valence electrons.

The claim is incorrect because Group 14 elements have no valence electrons.

Both elements are represented by symbols beginning with the letter “C.”

Both elements are located in the same group of the periodic table.

Both elements have the same number of neutrons.

Both elements have the same atomic number.

It has 14 neutrons.

It has 14 protons.

It has four core electrons.

It has four valence electrons.