The sodium atom loses an electron to form a sodium ion (Na+). Which statement is correct with respect to its atomic radius?

Answers

Answer 1

Answer:

The atomic number of sodium is 11. Sodium is a metal and it has the electronic configuration: 2, 8,1. This configuration implies that, the electrons in an atom of sodium are distributed into three different shells and the outermost shell has one electron in it. If sodium decide to give away the electron on its outermost shell, it will have 10 electrons left and those electrons will be distributed in only the first two shells and then it will be described as an ion. The third shell will not exist again because the electron there has been given away. Thus, the sodium ion is going to have a smaller atomic radius because its size has been reduced. This implies that the sodium ion will have a smaller radius than the sodium atom.

Answer 2

Answer: Its atomic radius increases because there is less electron shielding after the sodium loses one e-. Sodium is a nonmetal which means it forms an anion. Anions always increase from their original atomic radius

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What are the 4 types of bonds carbon can form and their structures

Answers

The most common bond carbon can form is a covalent bond. Carbon shares electrons with other atoms. This includes carbon-carbon bonds and carbon-hydrogen bonds. Another type of bond carbon can make is an ionic bond but this is a less common bond. For example is Calcium Carbide.

How many moles of CaO are needed to react with an excess of water to form 370 grams of calcium hydroxide?

Answers

The required moles of CaO are needed to react with an excess of water to form 370 grams of calcium hydroxide is 280g.

What is the relation between mass & moles?

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

W = given mass
M = molar mass

Given chemical reaction is:

CaO + H₂O → Ca(OH)₂

Moles of Ca(OH)₂ = 370g / 74g/mol = 5mol

From the stoichiometry of the reaction, 5 moles of CaO is required to produce 5 moles of Ca(OH)₂.

Mass of CaO = (5mol)(56g/mol) = 280g.

Hence required mass of CaO is 280g.

To know more about mass & moles, visit the below link:
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CaO + H20 --> Ca(OH)2

Calcium Hydroxide has a relative molecular mass of approximately 74 grams. Therefore, with 370 grams provided, we have 370g/74g, or 5 moles.

Therefore, due to molar ratios, 5 moles of CaO must have reacted with 5 moles of H2O to form 5 moles of Ca(OH)2.

The answer to your question is 5 moles of CaO or 280 g of CaO

NEED HELP ASAP PLEASEWhich of these compounds is covalently bonded?
Select one:
a. KF
b. MgF2
c. NO2
d. Na2S

Answers

C. NO2 is covalent. Hope this helps!

An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?A. 30 protons, 30 electrons
B. 15 protons, 15 electrons
C. 60 protons, 30 electrons
D. 30 protons, 0 electrons

Answers

A because it has to remain balanced.

How are genes sex chromosomes inherited

Answers

Take this with a grain of salt. If I remember correctly, the sex chromosomes of one parent carry all genetic code that equates to one half of a child's genetic makeup. That's why a male and female sex cells combine. The combination of the sperm and egg give the future child both genetic makeup of both parents.

Now, diseases and such can be passed along to the child if there's a defect on the sex chromosomes, the only chromosomes that are passed to the child. A cut on the dad of the child wouldn't cause the child to be born with a cut since the sex chromosomes weren't affected.

Color blindness, on the other hand, is sex chromosome related and can be passed down to the child. Since the sex chromosomes tell the DNA how to grow and operate, there's a possibility that the chromosomes could tell the DNA to have color blindness put within the genes of the child since the parent(s) sex chromosomes have that. Hope this helped!

what volume of a 0.716 m kbr solution is needed to provide 25.5 g of kbr? 35.7 ml 14.7 ml 299 ml 0.299 ml 153 ml

Answers

Answer:

$\huge{ \boxed{299 \: ml}}$

Explanation:

The volume of KBr required can be found by using the formula;

$v = (m)/(M * c)$

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

m is the mass in grams

M is the molar mass in g/mol

From the question;

m = 25.5 g

c = 0.716

Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol

$\therefore \: v = (25.5)/(118.9 * 0.716) \n = 0.299 \: l \n \n \text{but} \: 1 \: l \: = 1000 \: ml \n \therefore0.299l \: = (0.299)/(1) * 1000 \: ml \n = 299 \: ml \n \therefore \: v = 299 \: ml$

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