Question

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

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

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

5.Which compund of an element in period 3 react with water to form a solution with a PH greater than 7?
A: SiO2
B: SiCl4
C: NaCl
D: Na2O
My answer is A
6. When Na,K, and Mg are arranged in increasing order of atomic radius (small first), which order correct?
A: Na,K,Mg
B:Na,Mg,K
C:K,Mg,Na
D:Mg,Na,K
my answer is D.

Can any one check my anser.

Answer 1

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>B is correct; I think A is true, also.</b>

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
<b>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.</b>

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
<b>No, it is easier to ionize Cs than Li. Look at F to I. F is a gas while iodine is a solid</b>

5.Which compund of an element in period 3 react with water to form a solution with a PH greater than 7?
A: SiO2
B: SiCl4
C: NaCl
D: Na2O
My answer is A
<b>Sand is essentially SiO2. Is that even very soluble in water?</b>

6. When Na,K, and Mg are arranged in increasing order of atomic radius (small first), which order correct?
A: Na,K,Mg
B:Na,Mg,K
C:K,Mg,Na
D:Mg,Na,K
my answer is D.
<b> yes.</b>