Question

1. magnesium (mg) is located to the right of sodium (na) because mg has

a. fewer protons
b. fewer neutrons
c. no protons
d. more protons

1. as you move from left to right on the periodic table, elements

a. become less metallic
b. have lower atomic number
c. have lower atomic weight
d. become more metallic

1. each column of the periodic table is

a. an element
b. a group
c. an isotope
d. a period

1. atoms that gain or lose electrons are called

a. metals
b. nonmetals
c. ions
d. isotopes

1. group 17 (7 a) elements form

a. +1 ions
b. -1 ions
c. +7 ions
d. -7 ions

Explanation:

1. In the periodic table, elements are arranged by increasing atomic number (number of protons). Mg (atomic number 12) has more protons than Na (atomic number 11).
2. As you move from left - to - right across a period, metallic character decreases due to increasing electronegativity and ionization energy.
3. Columns in the periodic table are called groups or families, which have similar chemical properties.
4. Atoms that gain or lose electrons are ions. Cations lose electrons and anions gain electrons.
5. Group 17 elements (halogens) have 7 valence electrons and tend to gain 1 electron to achieve a stable octet, forming -1 ions.

Answer:

1. d. More protons
2. a. Become less metallic
3. b. A group
4. c. ions
5. b. -1 ions