chem test

How many valence electrons are in an atom of magnesium (Mg)? A) 2 B) 3 C) 4 D) 5

A) 2

Which of these substances will not dissolve in water? A) Al(s) B) LiF (s) C) CuCl2 (s) D) CaCl2 (s)

A) Al(s)

Which type of substance will conduct electricity the best after dissolving in water? A) Ionic B) Covalent C) Metallic D) James

A) Ionic

Which of the following compounds contains the Mn+3 ion? A) MnO B) Mn2O3 C) MnBr2 D) MnS

B) Mn2O3

The octet rule states that atos tend to form bonds so that each atom has eight _______________ in its ______________ shell.

B) electrons; valence

What type of bonding is found in ZnCl2? A) metallic B) ionic C) covalent D) James

B) ionic

When phosphorus (P) has formed into an ion, what is its charge? A) 1+ B) 1- C)3- D) 5+

C) 3-

What state of matter is required to conduct electricty if a substance is not a transition metal? A) Solid B) Liquid C) Aqueous

C) Aqueous

Which of these groups have the same number of electrons?

C) Cl-1, Ar K+1

An atom that has seven valence electrons is in which group? A) alkali metals B) alkaline earth metals C) halogens D) noble gases

C) halogens

What part of the atom is responsible for bonding with other atoms? A) neutrons B) core electrons C) valence electrons D) protons

C) valence electrons

Which of the following pairs of elements is most likely to form an ionic compound? A) Mg and F B) O and Cl C) N and S D) Na and Al

D) Na and Al

When Oxygen (O) has formed into an ion, which noble gas shares its stability? A) Ne B) Ar C) Kr D) Xe

D) Xe

The Lead (II) ion and lead (IV) ion.. A) are polyatomic ions B) have the same charge C) have charges of +1 and +3 respectively D) have charges of +2 and +4 respectively

D) have charges of +2 and +4 respectively

diagram

diagram