Section 2: Modern Periodic Table Flashcards

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0
Q

Did Mendeleev know about protons

A

No, he developed his table before they were discovered

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1
Q

How are elements arranged in the modern periodic table

A

Increasing atomic number

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2
Q

Period

A

Each row in the table of elements

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3
Q

Why does the number if elements per period vary

A

The number of available orbitals increases from energy level to energy level

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4
Q

Group

A

Each column in the table

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5
Q

What do elements in groups have in common

A

Similar electron configurations, chemical properties, valence electrons

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6
Q

When do properties of elements repeat in a predictable way

A

When atomic elements are used to arrange elements into groups

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7
Q

Periodic law

A

Pattern of repeating qualities

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8
Q

Atomic mass

A

A value that depends on the distribution of an element’s isotopes in nature and the masses of those isotopes

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9
Q

Atomic mass unit

A

Defined as 1/12 the mass of a carbon 12 atom

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10
Q

Why do we have amu

A

The mass of an atom is extremely small

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11
Q

Weighted average

A

Some values are more important than others

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12
Q

How is Atomic Mass found

A

(Mass Number • Percentage) +

Mass Number • Percentage

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13
Q

What are elements classified as

A

State at room temperature, occurrence in nature, and general properties (metals nonmetals metalloids)

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14
Q

Metal qualities

A

Conductors of electric heat and current, mostly solids at room temp, malleable, ductile, varying reactivity

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15
Q

Transition metals

A

Elements that form a bridge between the elements on the left and right sides of the table, among first to be discovered, ability to form compounds with distinctive colors

16
Q

Nonmetals

A

Poor conductors. Low boiling points, mostly gases, brittle, varying reactivity

17
Q

Metalloids

A

Properties between metals and nonmetals. Ability to conduct heat varies with temp.

18
Q

Across a period from left to right (how metallic)

A

Less metallic and more nonmetallic

19
Q

Is it wise to hold sodium in ur hand

A

No, that would be imprudent.

20
Q

Where are the most reactive metals

A

Left side