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Chemistry > Periodic table > Flashcards

Periodic table Flashcards

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1
Q

Periodic mans elements with…

A

similar properties occur at regular intervals.

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2
Q

Mendeleev arranged elements in order of…

A

atomic mass.

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3
Q

Mendeleev sometimes switched…

A

the order of elements so they fitted in the pattern of other elements.

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4
Q

Mendeleev left…

A

gaps for undiscovered elements.

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5
Q

In modern periodic table elements are arranged…

A

in order of atomic number.

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6
Q

Modern periodic table has a group…

A

0(nobble gases)

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7
Q

Group 1 metals are…

A

alkali.

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8
Q

Group 1 metals have low…

A

density.

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9
Q

Group 1 metals melting point…

A

decreases as you go down.

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10
Q

Group 1 metals are all…

A

white solids and from colorless solution in water.

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11
Q

Group 1 metals with water produce…

A

hydrogen gas and hydroxide solution (alkaline).

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12
Q

Hydroxide dissolved in water forms…

A

alkaline solution.

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13
Q

Group 1 metals as you move down reactivity…

A

increases.

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14
Q

Group 1 metals reactivity increases because…

A

electron is further from nucleus and shielded from positive charged nucleus by other electrons. Therefore, it is easier to lose electron.

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15
Q

Group 0 are called…

A

noble gases.

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16
Q

Group 0 are very un…

A

reactive elements.

17
Q

Group 0 elements are stable because

A

they have a full outer electron shell.

18
Q

Group 0 the boiling point increases as…

A

the relative atomic mass increases(down the group)

19
Q

Group 0 each element has boiling point under…

A

0.

20
Q

Group 7 are called…

A

halogens.

21
Q

Group 7 boiling point and melting point increases…

A

as we move down the group.

22
Q

Group 7 elements from molecules with…

A

two atoms joined by covalent bond.

23
Q

Group 7 elements get less reactive as…

A

we move down the group.

24
Q

Group 7 why is it harder to get electron with larger atomic mass?

A
  • greater distance from the nucleus

- shielding by internal electrons

25
Q

More reactive halogen can…

A

displace a less reactive halogen from and aqueous solution of its salt. (Displacement)

26
Q

Elements in the same group in the periodic table have the…

A

the same number of electrons in the outer shell. This gives them similar chemical properties.

27
Q

How many electrons in the outer electron shell helium has?

A

2 in the outer shell.

28
Q

Halide ions have a

A

single negative charge.

29
Q

Group 1 metals first 3 elements are…

A

less dense than water.

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