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3 years ago

PORFA AYUDAA !!!

Chemistry

1 answer:

matrenka [14]3 years ago

6 0

Explanation:

The problem here is to find the atomic number of each of the element given.

Sum the powers of the configuration.

a- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

Atomic number is = 2 + 2 + 6 + 2 + 6 + 1 = 19

b- 1s² 2s² 2p⁶ 3s² 3p⁴

Atomic number = 2 + 2 + 6 + 2 + 4 = 16

c- 1s¹

Atomic number = 1

You might be interested in

How many total moles of ions are released when the following sample dissolves completely in water?

pogonyaev

Answer:

8.55 × 10²⁴ Ions

Explanation:

Ammonium Chloride is an ionic compound which contains a monatomic anion (Cl⁻ ; Chloride) and a polyatomic cation (NH₄⁺ ; Ammonium).

Hence, when added in water Ammonium Chloride ionizes as;

NH₄Cl → NH₄⁺ + Cl⁻

Hence, we can say that it produces two ions when dissolved in water.

Also,

We know that 1 mole of any substance contains exactly 6.022 × 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of ions contained by 7.1 moles of NH₄Cl, we will use following relation to first calculate the number of molecules as;

Moles = Number of Molecules ÷ 6.022 × 10²³ Molecules.mol⁻¹

Solving for Number of Molecules,

Number of Molecules = Moles × 6.022 × 10²³ Molecules.mol⁻¹

Putting values,

Number of Molecules = 7.1 mol × 6.022 × 10²³

Number of Molecules = 4.27 × 10²⁴ Molecules

So,

As,

1 Molecule of NH₄Cl contained = 2 Ions

So,

4.27 × 10²⁴ Molecules of NH₄Cl will contain = X ions

Solving for X,

X = 2 Ions × 4.27 × 10²⁴ Molecules / 1 Molecule

X = 8.55 × 10²⁴ Ions

8 0

3 years ago

What is the physical state of the smallest alkanes at room temperature?

dem82 [27]

They are gases at room temperature

Hope this helps:)

8 0

3 years ago

Show me the periodic table

yawa3891 [41]

I think this is what you wanted, so good luck!

8 0

3 years ago

zzz [600]

Answer:

i think kinetic energy sorry if I'm wrong.

6 0

3 years ago

What are the names of the following three compounds (see attached)

balu736 [363]

Answer:

1. 4-ethyl-1-heptene

2. 6-ethyl-2-octene

3. 1-butyne

Explanation:

The compounds are named according to IUPAC rules.

Compound 1:

Identify the longest carbon chain. This chain is called the parent chain.
Identify all of the substituents (groups appending from the parent chain).
The parent chain is numbered so that the multiple bonds have the lowest numbers (double has the priority over alkyl substituents).
The longest chain contains 7 carbon atoms, so taken the name hept.
The double bond between C1 and C2, so take no. 1 and add the suffix ene to hept "1-heptene".
The ethyl group is the alkyl substituent on position 4.
So the name is 4-ethyl-1-heptene.

Compound 2:

Identify the longest carbon chain. This chain is called the parent chain.
Identify all of the substituents (groups appending from the parent chain).
The parent chain is numbered so that the multiple bonds have the lowest numbers (double has the priority over alkyl substituents).
The longest chain contains 8 carbon atoms, so taken the name oct.
The double bond between C2 and C3, so take no. 2 and add the suffix ene to oct "2-octene".
The ethyl group is the alkyl substituent on position 6.

So the name is 6-ethyl-2-octene.

Compound 3:

Identify the longest carbon chain. This chain is called the parent chain.
Identify all of the substituents (groups appending from the parent chain), there is no substituents.
The parent chain is numbered so that the multiple bonds have the lowest numbers (Triple bond here take the lowest number).
The longest chain contains 4 carbon atoms, so taken the name but.
The triple bond between C1 and C2, so take no. 1 and add the suffix yne to but "1-butyne".

So the name is 1-butyne.

7 0

3 years ago