Did it on my final and got it right. :)
a. Oppositely charged ions attract
In an ionic bond, there is transfer of electrons from one atom to the other. The transfer of electrons is the crux of the formation of this bond type.
For ionic bonds to form, one atom, the donor release valence electrons to the accepting atom in order for this bond to be formed. The loss and gain of electrons makes such atom more stable and closely mimic the stable group 8 elements.
This transfer of electrons makes the donor atom to have a net positive charge as the number protons becomes more than that of the electrons.
The accepting atom would have more electrons now and become negatively charge.
The charge separation would therefore make the negatively charged acceptor attracted to the positively charged donor ion.
c) the attraction of an atom for the electrons in a covalent bond.
Electronegativity, symbol χ, is a chemical property describing an atom's ability of to attract a shared pair of electrons to itself. It is influenced by the atomic number of the atom and the distance between the valence electrons and the charged nucleus. As the electronegativity number of atoms increases, the more the atom attracts electrons towards itself.
Conexus: A, C, C, A
The correct answers are:
1. B. Mg loses two electrons.
When Mg and Br combine, 2 atoms of Br attaches itself to Mg. The chemical reaction is:
Mg + Br ---> MgBr2
Since Br is more electronegative than Mg, then Mg loses an electron per Br therefore losing 2 electrons.
2. D. An atom that gains electrons must be attracted to an atom that loses electrons.
An ionic bond is formed when one molecule is more electronegative than the other molecule which results in gaining and losing of electrons. The more electronegative molecule gains electron while the less electronegative loses electron.
D electronegativity, is the correct answer.
d) a person who learns about the world by observing it.
scientist are people who discover why and how things are done and made in the world.