All categories

3 years ago

How many electron shells/orbitals does the element Krypton (Kr) have?

Chemistry

1 answer:

dlinn [17]3 years ago

4 0

Answer:

Krypton has 4 orbital shells

<u>Extra Information:</u>

<em>Krypton has 36 electrons which are arranged in these 4 orbit shells, </em>

<em>The order in which electrons are arranged in these shells is 2,8,18,8</em>

You might be interested in

Indicate whether the following balanced equations involve oxidation-reduction. Check all that apply. Check all that apply. 2H2SO

guapka [62]

Answer : The balanced equations involve oxidation-reduction are:

(a) $2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

(b) $3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

(c) $NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given chemical reaction is:

$2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

This reaction involve oxidation-reduction reaction because the oxidation state bromine changes from (-1) to (0) which shows oxidation and sulfur changes from (+6) to (+4) which shows reduction.

(b) The given chemical reaction is:

$3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

This reaction involve oxidation-reduction reaction because the oxidation state sulfur changes from (+4) to (+6) which shows oxidation and nitrogen changes from (+5) to (+2) which shows reduction.

(c) The given chemical reaction is:

$NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

This reaction involve oxidation-reduction reaction because the oxidation state iodine changes from (-1) to (+5) which shows oxidation and chlorine changes from (+5) to (-1) which shows reduction.

(d) The given chemical reaction is:

$PBr_3(l)+3H_2O(l)\rightarrow H_3PO_3(aq)+3HBr(aq)$

This reaction does not involve oxidation-reduction reaction because the oxidation state of element present on reactant and product side are same.

3 0

3 years ago

I need help for this question

sesenic [268]

Answer:

Blanced

Explanation:

5 0

3 years ago

BARSIC [14]

5.426 x $10^{22}$ molecules are there in a deep breath of air whose volume is 2. 35 L at body temperature 36 C and a pressure of 740 torr.

Explanation:

Data given:

volume V = 2.35 L

Temperature T = 36 Degrees or 273.15 + 36 = 309.15 K

pressure P = 740 torr OR 0.973 Atm

R = 0.08205 L atm / mole K

n (number of molecules of gas)= ?

The formula used will be

PV = nRT

Putting the value of given variables in above equation:

n = $\frac{PV}{RT}$

= $\frac{0.973 x 2.35}{0.08205 x 309.15}$

= 0.0901 moles

According to Avagadro' s law that gases at equal volume, temperature and pressure contains same molecules.

number of molecules:

number of moles x avagadro number

0.0901 x 6.02 x $10^{23}$

= 0.54 x $10^{23}$

= 5.426 x $10^{22}$ molecules.

6 0

3 years ago

suppose you carry out a tlc separation of acetaminophen and phenacetin on silica gel using a nonpolar developing solvent. which

kakasveta [241]

Non-volatile mixtures can be separated using a process called thin layer chromatography (TLC). Since acetaminophen has a hydroxyl group, it is more polar than phenacetin.

<h3>Does acetaminophen or phenacetin have a lower Rf value?</h3>

Since acetaminophen has a hydroxyl group, it is more polar than phenacetin. Phenacetin will be more soluble and migrate to the top than the polar component because we are employing a non-polar solvent.

Non-volatile mixtures can be separated using a process called thin layer chromatography. The experiment is carried out on a piece of glass, plastic, or aluminum foil that has been lightly covered with an adsorbent substance. Typically, silica gel, cellulose, or aluminum oxide are utilized as the substance.

Because acetaminophen is more polar than phenacetin and nonpolar molecules pass through silica gel more quickly than polar ones do, acetaminophen would have a lower Rf value.

To learn more about TLC separation refer to:

brainly.com/question/24031676

#SPJ9

5 0

1 year ago

An atom with 20 protons and 20 electrons 20 neutrons is arranged according to?

Svetradugi [14.3K]

Quick Answer:
Calcium has 20 protons and 20 neutrons.This element is number 20 on the Periodic Table of the Elements and has an atomic weight of 40.078.

Long Answer:
The easiest way to determine the number of protons in an element is to look at its atomic number. The atomic number is printed above the element's symbol on the periodic table. Calcium has an atomic number of 20, so it has 20 protons.

Finding the number of neutrons in an element is slightly more difficult. The number of neutrons present corresponds to the element's mass number less the number of protons in the element. Rounding an element's atomic weight, which is listed below the element on the periodic table, is the best way to find the element's mass number.

Calcium's atomic weight of 40.078 rounds to a mass number of 40. Subtracting 20 from 40 yields a result of 20. This means an atom with 20 protons and 20 neutrons must be an atom of calcium.

In some cases, calcium does not have 20 neutrons. The element has several different isotopes, which are atoms of the same element that have different numbers of neutrons. Some calcium isotopes are stable, but others decay over time. Ca-49 has a half-life of just 8.7 minutes, while Ca-41 has a half-life of 103,000 years.

3 0

3 years ago