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What is the electron configuration for26 / 12 Mg^+2

1s2 2s2 2p6 3s2 3p2


1s2 2s2 2p6 3s2 3p6 4s2 3d4


1s2 2s2 2p6


1s2 2s2 2p6 3s2 3p6 4s2 3d6


1s2 2s2 2p6 3s2

Answers

Answer 1
Answer:

Answer:

The number of electrons for the Mg atom are 12 electrons. The electron configuration of magnesium is,

Mg (Z= 12) = 1s2 2s2 2p6 3s2

Explanation:

The first two electrons is placed in the 1s orbital. The 1s orbital can accommodate two electrons.

The next 2 electrons for magnesium go in the 2s orbital.

The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.

We’ll put six in the 2p orbital and then put the remaining two electrons in the 3s.

Therefore, the Magnesium electron configuration will be 1s22s22p63s2.

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A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half-life for 238U  206Pb is 4.5  109 yr.)
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What are some examples of matter?

Which of the following are lost or gained during a nuclear reaction?Group of answer choices

Electrons and nucleus

Protons and electrons

Electrons and neutrons

Protons and neutrons

Answers

Answer:

Protons and neutrons :)

Answer:

I think that is electrons and nucleus

Explanation:

It makes sense

If Nurse Antonio adds that 7 grams of NaCI to water to make 1 liter of solution, what is the molar concentration of the solution? Use dimensional analysis and show how you completed the unit conversion.

Answers

Given :

Nurse Antonio adds that 7 grams of NaCI to water to make 1 liter of solution.

To Find :

The molar concentration of the solution .

Solution :

Molecular mass of NaCl , m=58.44\ g/mol .

Now , number of moles is given by :

n=\frac{\text{Given weight}}{\text{Molecular Mass}}\n\nn=(7)/(58.44)\ mole\n\nn=0.12\ moles

Molarity is given by :

M=\frac{\text{Number of moles}}{\text{Volume ( in Liters)}}\n\nM=(0.12)/(1)\ M\n\nM=0.12\ M

Hence , this is the required solution .

Temperate deciduous trees lose their leaves in Fall. Explain why trees in temperate rainforest and tropical rainforest don’t lose their leaves. PLEASE HELP!!!!!!!!!!!!! 20 MORE MINUTES UNTIL I HAVE TO HAND THIS INN

Answers

Answer:

So trees in temperate don't lose their leaves because the weather events aren't harsh enough.

Trees in tropical rainforest don't lose their leaves because they are a different type of tree known as evergreens that are green all year round.

Explanation:

Ok so first we'll define some things

Deciduous Trees=  Trees that lose all of their leaves for part of the year.

Trees shed their leaves trees to try and survive harsh weather events.

Temperate deciduous trees lose their leaves in fall to better survive the winter conditions of extreme cold and reduced daylight.

Temperate rainforests = An area that doesn't experience extremely cold or extremely hot temperatures or what we would call harsh weather events.

Broad-leaved trees in tropical rainforests are known evergreen, they are known as this as they are green all year round.

What will an object moving at a constant velocity do?come to a stop, unless it is pushed by another force
A.increase in speed
B.maintain a constant velocity until acted on by another force
C.come to a stop on its own

Answers

Answer:B

Explanation: an object in motion will stay in motion until acted on by another force and an object in rest will stay in test until acted on by another force

Chemical reactions always produce explosions yes or no

Answers

not all reactions occur spontaneously. An explosion occurs when the reaction is so favorable that there is a large release of energy. An explosion can then drive more reactions.
No, they do not always produce explosions for an example baking can have a chemical reaction but you dont see my scrambled eggs explode when i make them

In chemical reactions, what does the law of conservation of mass mean?Group of answer choices

Matter is not created nor destroyed.

The total mass of the products is greater than the total mass of the reactants.

The total mass of the reactants is less that the total mass of the products.

Matter is not changed.

Answers

Answer

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
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