Valence Electrons
What is a valance electron?
When an atom gains or loses electrons, it has an electrical charge. It is known as:
Ion
What is a covalent bond?
Bond with "shared electrons"
What does it mean for an element to be oxidized
Losing an electron
The largest number of valence electrons an atom in the first shell can have is:
2
Sodium forms an ionic bond with chlorine when sodium ____ an electron and chlorine ____ an electron.
Loses, Gains
Groups of atoms held together by covalent bonds are called:
Molecules
In NaI, what element is oxidized and what is its oxidation number?
Na +1
The number of valence electrons in an atom of aluminum, atomic number 13, is:
3
Ionic bonds form what type of charges
between oppositely charged atoms.
What are the two types of covalent bonding?
Polar and non-polar
How many atoms of aluminum (Al), sulfur (S), and oxygen (O) are in each molecule of Al2(SO4)3?
2-aluminum, 3-sulfur, 12-oxygen
Atoms of elements in period 2 and period 3 are similar because the largest number of valence electrons their atoms may contain in the outermost energy level is:
8
The Mg atom becomes the ion, Mg2+, when it:
Loses 2 electrons
Daily Double
What are the differences between metals and nonmetals?
Elements in the first column of the periodic table are known as alkali metals. These elements, when ionized, have in common:
an oxidation number of 1+
Daily Double
How are the elements arranged in the periodic table?
What element am I? I am in the 13th group and 5th period. Find me in 10 seconds.
Daily Double
In your own words, what is the difference between chemical and physical change?
A molecule of water, formed when two hydrogen atoms (oxidation number 1+) and one oxygen atom (oxidation number 2-) bond, has an oxidation number of:
0