1. Which two elements react vigorously with each other?
A: Chlorine and lithium
B:Chlorine and potassium
C:iodine and lithium
D:iodine and potassium
my answer is B
B is correct; I think A is true, also.
2. which statement about electronegativty is correct.
A: Electronegativity decrease across a period.
B:Electronegativity increasse down a group
C: Metal generally have electronegativity values than non-metal
D:Noble gases have the highest electronegativity values.
my answer is A
A is not correct. EN increases across the periodic table. For example, Na has EN = about 0.9 while F is 4.0. PRABABLY C is th correct answer but you didn't write all of the answer but I suspect the word "lower" was omitted after values and before than. As it stands, none are correct.
4.Which statement is correct for a periodic trend?
A: Ionization energy increase from Li to Cs
B: Melting point increase from Li to Li to Cs
C: Ionization energy increase from F to I
D: Melting point increase from F to I
My answer is A
No, it is easier to ionize Cs than Li. Look at F to I. F is a gas while iodine is a solid
5.Which compund of an element in period 3 react with water to form a solution with a PH greater than 7?
My answer is A
Sand is essentially SiO2. Is that even very soluble in water?
6. When Na,K, and Mg are arranged in increasing order of atomic radius (small first), which order correct?
my answer is D.
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