Question

horizontal row in the periodic table
vertical column in the periodic table
a repetition of properties occurs when elements are
arranged in order of increasing atomic number.
type of element that is a good conductor of heat and
electric current
type of element characterized by the presence of electrons
in the d orbital
one - half the distance between the nuclei of two atoms when
the atoms are joined
basis for mendeleevs arrangement of the periodic table
subatomic particles that are transferred to form positive and
negative ions
ability of an atom to attract electrons when the atom is in a
compound
energy required to remove an electron from an atom
atomic radius
ionization energy
periodic law
atomic mass
metal
group
transition metal
period
electrons
electronegativity

Explanation:

1. For "horizontal row in the periodic table": A period is a horizontal row in the periodic table.
2. For "vertical column in the periodic table": A group is a vertical column in the periodic table.
3. For "A repetition of properties occurs when elements are arranged in order of increasing atomic number": This is the periodic law.
4. For "type of element that is a good conductor of heat and electric current": Metals are good conductors of heat and electricity.
5. For "type of element characterized by the presence of electrons in the d orbital": Transition metals have electrons in the d orbital.
6. For "one - half the distance between the nuclei of two atoms when the atoms are joined": This is the atomic radius.
7. For "basis for Mendeleev’s arrangement of the periodic table": Mendeleev arranged the periodic table based on atomic mass.
8. For "subatomic particles that are transferred to form positive and negative ions": Electrons are transferred to form ions.
9. For "ability of an atom to attract electrons when the atom is in a compound": This is electronegativity.
10. For "energy required to remove an electron from an atom": This is ionization energy.

Answer:

1. period
2. group
3. periodic law
4. metal
5. transition metal
6. atomic radius
7. atomic mass
8. electrons
9. electronegativity
10. ionization energy