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3 years ago

The symbol for a radioactive nuclide is Superscript 234 subscript 90 upper T h.. Which statement is correct?

Chemistry

2 answers:

Contact [7]3 years ago

4 0

The correct statement : The atomic number of the radioactive nuclide is 90.

<h3>Further explanation</h3>

In the following element notation,

$\large {{{A} \atop {Z}} \right X}$

X = symbol of elemental atom

A = mass number

= number of protons + number of neutrons

Z = atomic number

= number of protons = number of electrons, on neutral elements

The symbol for a radioactive nuclide :

$\tt ^{234}_{90}Th$

atomic number = 90

mass number = 234

number of neutrons = 234-90=144

number of protons = atomic number = 90

stiv31 [10]3 years ago

4 0

Answer:

A on EDG

Explanation:

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Arrange the ions N3-, O2-, Mg2 , Na , and F- in order of increasing ionic radius, starting with the smallest first. Arrange the

Bond [772]

Answer:

Order of increasing ionic radius starting from the smallest is

Mg2+ < Na+ < F- < O2- < N3-

Explanation:

Ionic radius is the distance between the nucleus and the electrons in the outermost shell of an ion. In the ions given about, it can be deducted that they all have the same number of electrons and are said to be isoelectronic. This shows us that they all have the same electrons and we can only seperate them by checking the respective charges on the ions. A more positive charge will have a smaller radius while a more negative will have a larger radius. This is because when an atom loses an electron and form a cation (+), the remaining electrons move closer to the nucleus and hence a smaller radius of the atom occurs. But when an atom gains n electron,it forms anion (-), the new electron leads to the shielding of the remaining electrons from the nucleus and a large radius of the atom occurs.

So therefore, the above ions all have 10 electrons in their shells and magnesium with atomic number 12 and having lost 2 electrons to become positively charge has the smallest radius compared to others.

Mg2+ = 12 protons, 10 electrons

Na+ = 11 protons, 10 electrons

F- = 9 protons, 10 electrons

O2- = 8 protons, 10 electrons

N3- = 7 protons, 10 electrons

N3- has the largest ionic radius and Mg2+ has the lowest ionic radius.

The order is thus, Mg2+ , Na+, F-, O2-, N3-

6 0

4 years ago

Last year Frank had a total income of $58,800. He sold a house and made a profit of $27,940. He also had monthly income of $80 f

ipn [44]

Answer: D.) 0.90.

Explanation:

3 0

2 years ago

If the products of a reaction are Co2 and 2H20, what is known about the<br>reactants?

Svetradugi [14.3K]

Answer:

Reactant : A combustion of hydrocarbon.

Explanation:

It is known that when hydrocarbons are involved in combustion, they produce carbon dioxide and water.

CxHy + (x+y/4)O2 ===> xCO2 + y/2H2O

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3 years ago

CH3

KATRIN_1 [288]

Answer:

A. Neopentane.

B. 2,2-dimethyl-propane.

Explanation:

Hello,

In this case, for the given compound we can spell out two possible names:

A. Neopentane: it is, because the molecule has five carbon atoms wherein there is a central one, bonded to the other four.

B. 2,2-dimethyl-propane: it is, because we find two methyl radicals at the second carbon.

Regards.

8 0

3 years ago

If 45.0 mL of 6.00M HCl is added to 130 mL of H2O, Determine the molarity of the final solution. (show work)

Ivahew [28]

2.07 M is the molarity of the final solution if 45.0 ml of 6.00M HCl is added to 130 ml of $H_{2}$ O.

Explanation:

Data given:

volume of HCl, V1 = 45 ml

molarity of the HCl solution, M1 = 6 M

final volume of the HCl solution after water is added, V2 = 130 ml

final molarity M2 =?

After the dilution, the molarity of the new solution can be found by using the formula:

M1V1 = M2V2

here M1 and V1 are the molarity and volume for concentrated solution, M2 and V2 represents the diluted solution's molarity and volume.

Applying the formula after rearranging the equation, we get

M2 = $\frac{M1V1}{V2}$

M2 = $\frac{6X45}{130}$

M2 = 2.07 M

The final molarity of the HCl solution is 2.07 M

4 0

4 years ago