In metallic colids, the forces of attraction are between the mobile valence electrons and
atoms
neutrons
the negative ions
positively charged nuclei
Correct answer is D
No explanation has been provided for this answer.
When element 20A combines with element 8Y,
a covalent compound, AY is formed
an ionic compound AY is formed
an ionic compound, A2Y is formed
a covalent compound, AY2 is formed
Correct answer is B
No explanation has been provided for this answer.
covalent
dative
ionic
metalic
Correct answer is B
No explanation has been provided for this answer.
Which of the following elements can conveniently be placed in two groups in the periodic table ?
Carbon
Copper
Hydrogen
Oxygen
Correct answer is C
No explanation has been provided for this answer.
Chlorine, bromine and iodine belong to the same group and
are gaseous at room temperature.
form white precipitate with AgNO3(aq)
react violently with hydrogen without heating
react with alkali
Correct answer is D
No explanation has been provided for this answer.