1. When a metal is heated in a flame, the flame
has a distinctive color. This information was
eventually extended to the study of stars because
A the color spectra of stars indicate which elements are present.
B a red shift in star color indicates stars are moving away.
C star color indicates absolute distance.
D it allows the observer to determine the size of stars.
2. Why is cobalt (Co) placed before nickel (Ni) on the periodic table of the elements even though it has a higher average atomic mass than nickel? A Nickel has one more proton.B Cobalt was discovered first.C Nickel has fewer electrons.D Cobalt has a lower density.
3. Generally, how do atomic masses vary throughout the periodic table of the elements? A They increase from left to right and top to bottom. B They increase from left to right and bottom to top. C They increase from right to left and top to bottom. D They increase from right to left and bottom to top.
Iodine would have chemical properties most like A manganese (Mn). B tellurium (Te). C chlorine (Cl). D xenon (Xe).
Which of the following elements is classified as a metal? A bromineB heliumC sulfurD lithium
Which of the following atoms has the largest
A barium (Ba) B chlorine (Cl)C iodine (I)D magnesium (Mg)
7 Which of the following atoms has six valence
electrons?A magnesium (Mg)B silicon (Si)C sulfur (S)D argon (Ar)
8 Which statement best describes the density of
an atom’s nucleus?
A The nucleus occupies most of the atom’s volume but contains little of its mass.
B The nucleus occupies very little of the atom’s volume and contains little of its mass.
C The nucleus occupies most of the atom’s volume and contains most of its mass.
D The nucleus occupies very little of the atom’s volume but contains most of its mass.