Questions on chemical structures of compound or elements
Posted: Mon Aug 23, 2021 11:17 pm
1)
The formulae of the ions of four elements are shown below.
O²⁻, F⁻, Li⁺, Mg²⁺
Which statement about these ions is correct?
They all have
a) The same number of electrons in their outer shells.
b) The same electronic structure as a noble gas.
c) The same number of protons in their nuclei.
d) More electrons than protons.
2)
What happens when sodium chloride melts?
a. Covalent bonds in a giant lattice are broken.
b. Electrons are released from atoms.
c. Electrostatic forces of attraction between ions are overcome.
d. Molecules are separated into ions.
3)
Below are two statements about metals.
1 Metals contain a lattice of negative ions in a ‘sea of electrons’.
2 The electrical conductivity of metals is related to the mobility of the electrons in the structure.
Which is correct?
a. Both statements are correct and statement 1 explains statement 2.
b. Both statements are correct but statement 1 does not explain statement 2.
c. Statement 1 is correct and statement 2 is incorrect.
d. Statement 2 is correct and statement 1 is incorrect.
My answers to 1) d, 2) d, 3) d.
I think above answers are correct. What do you think?
The formulae of the ions of four elements are shown below.
O²⁻, F⁻, Li⁺, Mg²⁺
Which statement about these ions is correct?
They all have
a) The same number of electrons in their outer shells.
b) The same electronic structure as a noble gas.
c) The same number of protons in their nuclei.
d) More electrons than protons.
2)
What happens when sodium chloride melts?
a. Covalent bonds in a giant lattice are broken.
b. Electrons are released from atoms.
c. Electrostatic forces of attraction between ions are overcome.
d. Molecules are separated into ions.
3)
Below are two statements about metals.
1 Metals contain a lattice of negative ions in a ‘sea of electrons’.
2 The electrical conductivity of metals is related to the mobility of the electrons in the structure.
Which is correct?
a. Both statements are correct and statement 1 explains statement 2.
b. Both statements are correct but statement 1 does not explain statement 2.
c. Statement 1 is correct and statement 2 is incorrect.
d. Statement 2 is correct and statement 1 is incorrect.
My answers to 1) d, 2) d, 3) d.
I think above answers are correct. What do you think?