Perodistcity

Chemists used the _____________ of elements to sort them into groups.

Properties

Chlorine, bromine, and iodine have very similar _____________ properties.

Chemical

Mendeleev arranged the elements in his periodic table in order of increasing __________________________.

Atomic Mass

The periodic table can be used to predict the _____________ of undiscovered elements.

Properties

In the modern periodic table, elements are arranged in order of increasing _________________________.

Atomic Number

Periodic law states that when elements are arranged in order of increasing atomic number, there is a periodic repetition of their ____________ and ____________ properties.

Physical, Chemical

What are three broad classes of elements?

Metals, Nonmetals, Metalloids.

Metals are good conductors of ____________ and ____________ .

Heat, Electricity

The nonmetals of Group 7A are called _____________.

Halogens

What are the representative elements?

Elements in groups 1A through 7A that display a wide range of properties.

In transition metals, the highest occupied s sublevel and a nearby __________ sublevel contain electrons.

D

Cations are always ____________ than the atoms from which they form.

Smaller

Anions are always ____________ than the atoms from which they form.

Larger

The energy required to remove an electron from an atom is called ____________ energy.

Ionization

Electronegativity is the measure of the ability of an atom to attract ____________ in a chemical bond.

Electrons

The transfer of electrons between atoms forms ____________ ions and ____________ ions.

Positive, Negative

As you move down a group in the periodic table, ionization energy tends to ____________ .

Decrease

As you move from left to right across a period, ionization energy tends to ____________ .

Increase

The ____________ effect is caused by the repulsion between kernel electrons and valence electrons.

Shielding

What is the atomic radius?

Half of the distance between the nuclei of two atoms of the same element when the atoms are joined.

What is the most active metal?

Francium

What is the most active nonmetal?

Fluorine

The behavior of a metalloid can be controlled by changing ____________.

Conditions

The noble gases have electron configurations with filled ____________ and ____________ orbitals.

S, P