C1 Development of the periodic table Flashcards

1
Q

What is the periodic table?

A

A tabular arrangement of chemical elements organized by increasing atomic number.

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2
Q

Who is credited with the first widely recognized periodic table?

A

Dmitri Mendeleev.

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3
Q

True or False: The periodic table is arranged in rows called periods and columns called groups.

A

True.

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4
Q

What does the atomic number represent?

A

The number of protons in an atom’s nucleus.

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5
Q

Fill in the blank: Elements in the same group of the periodic table have similar __________.

A

chemical properties.

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6
Q

Which element is in Group 1 of the periodic table? Check

A

Lithium (Li).

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7
Q

What are noble gases?

A

A group of elements in Group 18 that are inert and do not readily react with other elements.

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8
Q

What is the significance of Mendeleev’s periodic law?

A

It states that the properties of elements are a periodic function of their atomic weights.

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9
Q

Which element has the atomic number 6?

A

Carbon.

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10
Q

True or False: Transition metals are found in the middle of the periodic table.

A

True.

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11
Q

What is the primary characteristic of alkali metals?

A

They are highly reactive and have one electron in their outer shell.

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12
Q

What are lanthanides and actinides?

A

Two series of elements that are placed below the main body of the periodic table.

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13
Q

Multiple Choice: Which of the following elements is a halogen? A) Oxygen B) Chlorine C) Argon

A

B) Chlorine.

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14
Q

What do elements in the same period have in common?

A

They have the same number of electron shells.

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15
Q

Fill in the blank: The periodic table is divided into __________ and __________ elements.

A

metals; nonmetals.

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16
Q

What is the general trend in reactivity for alkali metals as you move down the group?

A

Reactivity increases.

17
Q

Which property generally decreases across a period from left to right?

A

Atomic radius.

18
Q

True or False: Nonmetals are usually good conductors of electricity.

19
Q

What are metalloids?

A

Elements that have properties of both metals and nonmetals.

20
Q

Which scientist arranged elements by atomic mass before Mendeleev?

A

John Newlands.

21
Q

What major change occurred in the periodic table in the 20th century?

A

It was rearranged by atomic number instead of atomic mass.

22
Q

What is an isotope?

A

Atoms of the same element that have different numbers of neutrons.

23
Q

Multiple Choice: Which of the following is a characteristic of metals? A) Brittle B) Shiny C) Poor conductors

24
Q

Fill in the blank: The elements in Group 17 are known as __________.

25
Q

What is the main characteristic of group 1 elements?

A

They have one electron in their outer shell and are highly reactive.

26
Q

What is the common use of noble gases?

A

They are used in lighting and as inert environments for chemical reactions.