All categories

3 years ago

What's the atomic number

Chemistry

1 answer:

nadezda [96]3 years ago

8 0

Answer:

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number. An atom of iron has 26 protons in its nucleus; therefore the atomic number of iron is 26.

Explanation:

please mark me brainliest please

You might be interested in

The volume of a gas is 550 mL at 960 mm Hg and 200.0 C. What volume

Masja [62]

Answer:

The volume will be 568.89 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. That is, the pressure of the gas is directly proportional to its temperature. Gay-Lussac's law can be expressed mathematically as follows:

$\frac{P}{T}=k$

Where P = pressure, T = temperature, K = Constant

Finally, Charles's law indicates that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

$\frac{V}{T}=k$

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

$\frac{P*V}{T} =k$

Studying an initial state 1 and a final state 2, it is fulfilled:

$\frac{P1*V1}{T1} =\frac{P2*V2}{T2}$

In this case:

P1= 960 mmHg
V1= 550 mL
T1= 200 C= 473 K (being 0 C=273 K)
P2= 830 mmHg
V2= ?
T2= 150 C= 423 K

Replacing:

$\frac{960 mmHg*550 mL}{473K} =\frac{830 mmHg*V2}{423 K}$

Solving:

$V2=\frac{423 K}{830 mmHg} *\frac{960 mmHg*550 mL}{473K}$

V2= 568.9 mL

<u><em>The volume will be 568.89 mL.</em></u>

4 0

3 years ago

❤Bree here! I need some help! ❤

lora16 [44]

I think its B. Chemical Change

5 0

3 years ago

Read 2 more answers

Consider the balanced reaction: 4Ga(s) + 3O2(g)⟶ 2Ga2O3(s)

Paha777 [63]

First we need to find the number of moles that 43.9g of gallium metal is. We can do this by finding the molar weight of gallium and cross-multiplying to cancel out units:

$\frac{1mole}{69.723g}*\frac{43.9g}{1}=0.63mol_{Ga}$

So we are dealing with 0.63 moles of gallium metal.

We can take from the balanced equation that 4 moles of gallium metal will react completely with 3 moles of oxygen gas. We can take this ratio and make a proportion to find the amount of oxygen gas, in moles, that will react completely with 0.63 moles of gallium metal:

$\frac{4moles_{Ga}}{3moles_{O_{2}}} =\frac{0.63moles_{Ga}}{xmoles_{O_{2}}}$

Cross multiply and solve for x:

$4x=1.89$

$x=0.47moles_{O{2}}$

So now we know that 0.47 moles of oxygen gas will react with 43.9g of gallium metal.

5 0

3 years ago

The protons account for about half the mass of most elements. Protons are located in the atomic nucleus along with the neutrons

Lady_Fox [76]

Answer:

Explanation:

The electrical charge on protons are positive charges.

Protons are subatomic particles and they carry positive charges on them. In all instances, they are found in the tiny nucleus along with neutrons.

Both protons and neutrons contributes the bulk mass of an atom whereas electrons is negligible and inconsequential to the mass of the atom.

Electrons carry negative charges within an atom with a charge of -1
Neutrons are uncharged subatomic particles.
Protons carry positive charges, +1

7 0

3 years ago

Suppose a fox population exists in an ecosystem. Some of the foxes maintain a heavy coat year-round, while others shed their hea

algol [13]

Answer:

The fox who shed their heavy coat in the summer.

Explanation:

If a fox has the ability to shed its coat in the summer, it will have no difficulties adapting to new temperatures even during winter. However, the heavy-coated one will.

4 0

3 years ago

What's the atomic number​

What's the atomic number