Question

1. which is a general characteristic of metals?

a. poor conductors of heat
b. brittle structure
c. good conductors of electricity
d. low melting points

1. what does the staircase on the periodic table separate?

a. metals from noble gases
b. metals from nonmetals
c. nonmetals from noble gases
d. metalloids from metals

1. what are the outermost electrons that determine chemical reactivity called?

a. protons
b. neutrons
c. nucleus electrons
d. valence electrons

1. who proposed that atoms are indivisible particles?

a. dalton
b. rutherford
c. thomson
d. chadwick

1. what type of bond involves the sharing of electron pairs between atoms?

a. ionic bond
b. covalent bond
c. hydrogen bond
d. metallic bond

1. elements to the right of the staircase on the periodic table are classified as:

a. metals
b. metalloids
c. nonmetals
d. transition elements

1. the mass of an atom is determined by adding the number of:

a. protons and electrons
b. electrons and neutrons
c. protons and neutrons
d. neutrons and energy levels

Explanation:

1. Metals are known for high electrical conductivity; other options describe nonmetal properties.
2. The periodic table staircase divides metals (left) and nonmetals (right).
3. Valence electrons are the outermost electrons governing reactivity.
4. Dalton's atomic theory stated atoms are indivisible.
5. Covalent bonds form via shared electron pairs between atoms.
6. Nonmetals lie to the right of the periodic table staircase.
7. Atomic mass comes from protons + neutrons (electrons have negligible mass).

Answer:

1. C. Good conductors of electricity
2. B. Metals from nonmetals
3. D. Valence electrons
4. A. Dalton
5. B. Covalent bond
6. C. Nonmetals
7. C. Protons and neutrons