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4 years ago

What is the atomic number and what does the atomic number indicate?

Chemistry

2 answers:

Lunna [17]4 years ago

7 0

Atomic number is a number of element to show his situation in periodic table.

Atomic number indicate number of electrons........

kakasveta [241]4 years ago

5 0

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons.

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What is the term for a chemical reaction that uses more energy to break bonds than it releases when forming them?

Alchen [17]

Answer: Endothermic Reaction

Explanation:

7 0

3 years ago

A compound consists of 75% magnesium and 25% oxygen. Find the empirical formula.

laila [671]

<h2>Answer:</h2>

% Composition of elements:

Magnesium = 75%
Oxygen = 25%

Atomic mass of given elements:

Magnesium = 24 g
Oxygen = 16 g

Now, divide % composition by Atomic mass:

$\footnotesize\implies Mg = \dfrac{\% \: Composition}{Atomic \: mass} = \dfrac{75}{24} = \bf 3.125$

$\footnotesize\implies O = \dfrac{\% \: Composition}{Atomic \: mass} = \dfrac{25}{16} = \bf 1.5625$

Simplest Ratio:

$\footnotesize\implies Mg = \dfrac{3.125}{1.5625} = 2$

$\footnotesize\implies O = \dfrac{1.5625}{1.5625} = 1$

Empirical Formula:

$\footnotesize\implies \underline{ \boxed{ \red{ \bf Empirical \: Formula = Mg_2O}}}$

8 0

3 years ago

Which animal is a secondary consumer in the temperate coniferous forest?

love history [14]

I positive that the answer is wolf hope that helps

4 0

3 years ago

A substance that contains more hydroxide ions than hydronium ions in solution could have which pH value?

Hunter-Best [27]

Hydronium ions are basically H+ ions.
So if [OH-]>[H+]
This means that the substance is more basic.
and basic substances a pH>7.
Therefore a possible pH value would be 10.

6 0

4 years ago

When transition metal atoms lose electrons to form ions, the electrons come first from the highest filled s atomic orbital. With

kap26 [50]

The atomic number of Fe= 26

The electronic configuration of Fe will be

1s2 2s2 2p6 3s2 3p6 4s2 3d6

When it loses two electrons to form ferrous ion (Fe(II)) the electrons will be loose by 4s orbital first

So the electronic configuration of Fe^+2 ion will be

1s2 2s2 2p6 3s2 3p6 3d6

Hence there are six electrons in 3d orbital of iron dipositive ion

Now the the electrons in 3d orbital will be like:

so there are four unpaired electrons

5 0

3 years ago