Find the halogen group/family in the periodic table of elements. The family begins with the element fluorine, F and is column number #17.
What statements can you make about all the elements in the halogen
family? All BUT ONE statement is true.
A)
All of the halogens are non-metals.
B)
Chemically, the halogens are very much alike.
All the halogens have seven valence electrons.
D
The halogens combine with metals in a 1.1 ratio.

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Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.