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1 year ago

Give the group number and general electron configuration of an element with each electron-dot symbol:

1 answer:

4 0

The group number of (a) is VA(15) and electronic configuration is 1s2 2s2 2p3 . the group number of (b) is IVA(14) and the electronic configuration is 1s2 2s2 2p2 .

What is electronic configuration ?

it shows the distribution of electrons in the atomic orbitals .

it follows a standard notation of s, p, d, f atomic orbitals in which electronic distribution of an atom occurs .

it has standard notation method as well as condensed electron configuration .

it is useful in determining the valency of an element .

it is useful in predicting the properties of a group of elements .

<h3>What is condensed electron configuration ?</h3>

It contains the symbol of the nearest , smaller noble gas in the square brackets and then the symbols of the occupied orbitals which contains valance electrons .

Example of condensed electron configuration is given by ,

in case of iron the electronic configuration is 1s2 2s2 2p6 3s2 4s2 3d6 .

Thus , the condensed electron configuration of iron is [Ar] 3d6 4s2 .

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evablogger [386]

If 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

<h3>What is decomposition reaction?</h3>

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.

There are three different kinds of breakdown reactions: thermal, photolytic, and electrolytic.

$Mass_{reactant$ = $Mass_{product}$

$Mass_{mercury oxide$ = $Mass_{mercury} + mass_{oxygen}$

28g = $mass_{mercury}$ + 2g

$mass_{mercury}$ = 26g

Thus, 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

$percentage mass_{mercury} = \frac{mass_{mercury}}{mass_{mercury}oxide}$ X 100%

= 26g/28g

= 93%

thus 93% is the percent by mass of Hg present in HgO.

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4 0

1 year ago

What invention helped to contribute to the start of the civil war

lawyer [7]

Answer:

The Cotton Gin

Explanation:

The cotton gin: A game-changing social and economic invention. On this day in 1793, young inventor Eli Whitney had his U.S. patent for the cotton gin approved, an invention that would definitely have an impact on social and economic conditions that led to the Civil War.

5 0

3 years ago

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14 billion years (roughly the age of the universe) to seconds. (Assume there are 365 days in a year.)

fenix001 [56]

Answer:

4.41 × 10¹⁷ Seconds

Explanation:

For this problem we will first find out the number of days in 14 billion years.

Remember that 1 billion is equal to 1,000,000,000 or 10⁹. So, 14 billion years will be written as 14,000,000,000 or 1.4 × 10¹⁰ years.

Therefore, In

1 year there are = 365 years

So, In

1.4 × 10¹⁰ years there will be = X years,

Solving for X,

X = 1.4 × 10¹⁰ years × 365 days / 1 year

X = 5.11 × 10¹² days

Secondly, as there are 24 hours per day and each hour has 60 minutes and each minute has 60 seconds, therefore, the number of seconds per day are calculated as,

Number of Sec/day = 24 × 60 × 60

Number of Sec/day = 86400 sec/day

Hence, If,

1 day has = 86400 seconds

then,

5.11 × 10¹² days will contain = X seconds

Solving for X,

X = 5.11 × 10¹² days × 86400 sec / 1 day

X = 4.41 × 10¹⁷ Seconds

6 0

4 years ago

A displacement reaction takes place when calcium is placed in a solution of zinc chloride. Which substances will most likely be

Karolina [17]

Hi!

The correct option would be A.

This is because the displacement reaction would take place as follows

Ca + ZnCl2 --> CaCl2 + Zn

A displacement reaction is one in which a substitution occurs, as the more reactive element in the mixture replaces one that is less reactive.

In the electrochemical series, we find Ca higher than Zn, which is indicative of Ca being more reactive, and having the capacity to displace Zn to form a compound.

Option D would be incorrect as no such substitution occurs.

Option B would be incorrect because again, there is no substitution occurring, and also because two metals alone (Ca and Zn in our case) can never react to form a compound.

Option C would be incorrect because it is not possible because CaCl and ZnCl are forms that are too unstable to exist due to an overall positive charge.

Hope this helps!

5 0

3 years ago

The Greeks were the first to use the term _____. atom electron neutron proton

kotegsom [21]

I think the correct answer from the choices listed above is the first option. The Greeks were the first to use the term atom. In 450 BCE, Democritus coined the term átomos which means "uncuttable" or "the smallest indivisible particle of matter".

6 0

3 years ago

Read 2 more answers