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24 Terms

1

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

Properties

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2

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

Chemical

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3

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

Atomic Mass

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4

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

Properties

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5

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

Atomic Number

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6

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

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7

What are three broad classes of elements?

Metals, Nonmetals, Metalloids.

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8

Metals are good conductors of ____________ and ____________ .

Heat, Electricity

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9

The nonmetals of Group 7A are called _____________.

Halogens

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10

What are the representative elements?

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

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11

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

D

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12

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

Smaller

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13

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

Larger

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14

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

Ionization

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15

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

Electrons

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16

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

Positive, Negative

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17

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

Decrease

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18

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

Increase

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19

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

Shielding

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20

What is the atomic radius?

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

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21

What is the most active metal?

Francium

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22

What is the most active nonmetal?

Fluorine

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23

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

Conditions

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24

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

S, P

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