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3 years ago

Connect the group to the configuration.pleas help !!

Chemistry

2 answers:

butalik [34]3 years ago

8 0

Answer:

2, 8 7 7 valence electrons Group 7

2, 8 , 1 1 valence electrons Group 1

2 8 3 3 valence electrons Group 3

2 4 4 valence electrons Group 4

2 8 8 2 2 valence electrons Group 2

Explanation:

The valency of an electronic configuration of an atom can be used to determine the group an element belongs.

The valency is the number of outermost shell electrons an atom contains.

So;

2, 8 7 7 valence electrons Group 7

2, 8 , 1 1 valence electrons Group 1

2 8 3 3 valence electrons Group 3

2 4 4 valence electrons Group 4

2 8 8 2 2 valence electrons Group 2

LenaWriter [7]3 years ago

7 0

Explanation:

The group number in the periodic table represents number of valence electrons of the elements in a certain group.

Group 1 : 2,8,1

Group 2 : 2,8,8,2

Group 3 : 2,8,3

Group 4: 2,4

Group 7 : 2,8,7

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3 years ago

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Based on your answer in part B, arrange the five elements in order of their reactivity. Drag the most reactive element to the to

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Answer: Order of the elements from most reactive to least reactive is:

Mg > Zn > Fe > H > Cu

Explanation: Reactivity of the elements is the tendency of the elements to loose or gain electrons with ease.

As, all the given elements are metals, so the metals which will loose electrons easily will be more reactive. To study the reactivity of metals, we use reactivity series.

The metals which are more reactive are placed on the top of the reactivity series and which are less reactive are placed at the bottom.

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Reactivity series is attached below.

6 0

4 years ago

Determine the resulting pH when 75 mL of 0.05M HBr is reacted with 74 mL of 0.075 M KOH

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Answer:

pH = 12.08

Explanation:

H⁺ + OH⁻ → H₂O

First we calculate how many moles of each substance were added, using the given volume and concentration:

HBr ⇒ 0.05 M * 75 mL = 3.75 mmol HBr

KOH ⇒ 0.075 M * 74 mL = 5.55 mmol KOH

As HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.

As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we calculate how many OH⁻ moles remain after the reaction:

5.55 - 3.75 = 1.8 mmoles OH⁻

With that number of moles and the volume of the mixture, we calculate [OH⁻]:

[OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 M

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3 years ago

Which is a direct result of increased consumption of metals?

borishaifa [10]

Climate change from the use of metals i think sorry if i’m wrong that one seems the most ligit to me

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3 years ago

Calculate the molar solubility of ca(io3)2 in each solution below. the ksp of calcium iodate is7.1 × 10−7.

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some.......0..........0 
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less........x.........2x

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3 years ago

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