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omeli [17]
3 years ago
11

An atom has the electron configuration of 1s22s22p5 how many electrons are in that atom

Chemistry
1 answer:
notsponge [240]3 years ago
7 0

Answer:

There are 9 electrons in this atom.

Explanation:

Electron configuration of this atom: 1s^2\, 2s^2\, 2p^5.

The electron orbitals of an atom are denoted as 1s, 2s, 2p, 3s, 3p, etc. At any given time, an electron in this atom is located in exactly one orbital.

The electron configuration of an atom gives the number of electrons in each orbitals of this atom.

For example, in this atom, the superscript "2" on the right of "1s" means that there are two electrons in the 1s\! orbital of this atom. Hence, 1s^2\, 2s^2\, 2p^5 would translate to:

  • The 1s orbital of this atom contains 2 electrons.
  • The 2s orbital of this atom contains 2 electrons.
  • The 2p orbitals of this atom contain 5 electrons.

Hence, there would be 2 + 2 + 5 = 9 electrons in total in this atom.

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Which element would mostly have chemical properties similar to that of magnesium (Mg)?
DanielleElmas [232]

The elements of same group are placed in same group as they have similar properties. So Calcium is the element which resembles Mangesium.

Calcium and Magnesium both are alkaline earth metals.

They have similar properties as they have similar outer or valence shell electronic configuration

The general electronic configuration of alkaline earht metal is ns2

The electronic configuration of Mg [atomic number 12] and Ca [atomic number 20] are

[Ne]3s^{2}  and [Ar]4s^{2} respectively.


7 0
3 years ago
How many half-lives would something have gone through if you had 75% daughter product and 25% parent?
levacccp [35]

Answer:

Two Half-lives

Explanation:

Let number of Parent nuclei Initially present be X,

Then, finally \frac{X}{4} Parent nuclei Will remain with \frac{3X}{4} daughter nuclei.

In one half- life , parent nuclei becomes half of initial.

So, starting with X parent nuclei,

After one half-life, it will degrade to \frac{X}{2} .

After another half life , Parent nuclei will become half of \frac{X}{2}

Which is equal to \frac{X}{4}.

So, Parent nuclei have to go through Two half-lives.

6 0
3 years ago
Draw the product of the reaction between CH3CH=CHCH3 and H2 under a platinum catalyst.
Pani-rosa [81]

Answer:

CH₃CH₂-CH₂CH₃

Explanation:

When an alkene, R-CH=CH-R reacts with H₂ in a Pt catalyst, the analogue alkane, R-CH₂-CH₂-R, is produced (Hydrogenation of alkenes via Pt/Pd catalyst)

Thus, the reaction of CH₃CH=CHCH₃ with H₂ under a platinum catalyst produce:

<h3>CH₃CH₂-CH₂CH₃</h3>

The analogue alkane

4 0
3 years ago
Calculate the mass of khc8h4o4 that reacts with 15 ml of the naoh solution
dlinn [17]
The balanced chemical reaction would be:

 KHC8H4O4<span> (aq) + </span>NaOH<span> (aq) → NaKC8H4O4 (aq) + H2O.

The concentration of the NaOH is equal 0.1 M. We use this and the volume given above to determine the mass of KH</span>C8H4O4. We do as follows:

0.1 mol / L NaOH (.015 L) ( 1 mol KHC8H4O4 / 1 mol NaOH) (204 g / 1 mol) = 0.306 g KHC8H4O4


6 0
3 years ago
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
cupoosta [38]
MgO
MgI2
PbO2
PbI4

These are the possible compounds
4 0
3 years ago
Read 2 more answers
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