CHEMISTRY HIGH SCHOOL

Which of these elements has an electron configuration of [Kr]5s2?barium

calcium

rubidium

strontium

Answers

Answer 1
Answer: Given this abbreviated electron configuration, we begin from the row of the periodic table that contains Krypton (Kr). Then since the remaining electrons are 5s2 (which indicates 2 electrons in the 5s orbital), we check the next row (the 5th row) and find the 2nd element, which would contain two electrons. The first element is rubidium, while the second is strontium, so this means that Sr is the final answer.
Answer 2
Answer:

The element which has  an electron configuration of [Kr] 5s² is calcium .

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with sameatomic numberare atoms of same element.

Learn more about element,here:

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In the pie chart below, which of the following represents the amount of Earth's water located in the oceans?A pie chart with part A representing 2%, part B representing .8%, part C representing .2% and part D representing 97%.


A only
A and B
C only
D only

Answers

In the pie chart above, the pie chart that represents the amount of Earth's water located in the oceans is D only. The rest of the choices are too small for the amount of water that is present on Earth.

Answer: D only.

Explanation:

The amount of Earth's water located in oceans is 97%. Rest 3% is in the form of rivers, glaciers, polar ice-caps, lakes and ground water. Out of this 3% also, only 0.3% is freshwater which found in swamps, lakes and rivers.

In the pie chart, part D represents 97%. Thus, part D only represents the amount of Earth's water located in the oceans.

All of the following are part of the digestive system except the __________.Select one of the options below as your answer:a. stomach
b. esophagus
c. intestines
d. heart

Answers

D. HeartThe esophagus pushes the food from your mouth to your stomach which digests your food and sends it into the small intestine for even further digestion. The heart has nothing to do with this process of digestion. It pumps blood through your body in the circulatory system
d. heart is the correct answer because heart is a part of circulatory system~

A mixture of sand and salt containig MgCl2 (100.0 g) is sprinkled on a section of pavement. The total estimated ice on the pavement is 10.0 kg. What is the freezing point of the ice (°C)? MM MgCl2 = 95.211 g/mol MM ice = 18.0148 g/mol

Answers

Answer:

-0.6⁰c

Explanation:

find the solution below

Which substance represents a compound?(1) C(s) (3) CO(g)(2) Co(s) (4) O2(g)

Answers

The substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

From the question,

We are to determine which of the given substances is a compound.

First, we will define a compound

A compound is a chemical species that is formed when two or more atoms join together chemically, with covalent or ionic bonds.

OR

A compound is a substance that contains atoms of two or more different elements, and these atoms are chemically joined together

NOTE: A molecule consisting of atoms of only one element is NOT a compound.

Among the given options, only CO satisfies the definition of a compound, because it contains two different elements, Carbon (C) and Oxygen (O).

Hence, the substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

Learn more here: brainly.com/question/12862037
C = Carbon
CO = Carbon Monoxide
Co = Cobalt
O2 = Oxygen

So the answer is (3) CO

What is the oxidation number of sulfur in hydrogen sulfide

Answers

H₂S ( hydrogen sulfide ):

H =  + 1

S ( Sulfur ) =  - 2

hope this helps!

D Question 17 5 pts If the probability of rain is 85%, then the probability of no rain is: O 85 % 25 % O 15 % O 50 %

Answers

If the probability of rain is 85%, then the probability of no rain would be 100% - 85% = 15%. Therefore, the correct answer is 15%.


I hope this helps.

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