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uranmaximum [27]
3 years ago
7

An atom has the following electron configuration.

Chemistry
2 answers:
saul85 [17]3 years ago
8 0

Answer:

vanadium has 5 valence electrons

Explanation:

The element with electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d3

has 23 electrons. This element is Vanadium.

For Vanadium, the atomic number is 23 and the electronic configuration given is  

1s2 2s2 2p6 3s2 3p6 4s2 3d3

Vanadium's ground state electron configuration is [Ar] 3d3 4s2.

Thus vanadium has 5 valence electrons and during ionic bonding, s-shell electrons are lost first and than d-shell electrons would be lost.

Wewaii [24]3 years ago
3 0

Answer: 5

Explanation: add up all the electrons and it will amount to 23. Arranging by the old model for electronic configuration, we have : 2, 8, 8, 5

The last number being 5 represent its valence electron

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Which postulate of Dalton's atomic theory is the result of the law of conservation of mass
creativ13 [48]

The postulate of Dalton's atomic theory which is a result of the law of conservation of mass is: Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction.

8 0
3 years ago
How many moles are in 4.24kg of Na2CO3?
frosja888 [35]
40.0 is the answer, sorry, I had some lag, I would've answered it like 5 minutes ago

Hope I helped
8 0
3 years ago
Epsom salt, a common hydrate, has the formula shown below. If I measure out 125 g of epsom salt to add to my foot soak, what mas
tatiyna

Answer:

The answer to your question is 64.02 g of H₂O

Explanation:

Data

Mass of magnesium sulfate hepta hydrated = 125 g

Mass of water = ?

Process

1.- Calculate the molar mass of the salt and the molar mass of water

molar mass of MgSO₄ 7H₂O = 24 + 32 + 64 + 14 + 112 = 246 g

mass of H₂O = 2 + 16 = 18 g

2.- Use proportions to calculate the mass of water in the epsom salt

                246 g MgSO₄ 7H₂O------------------------- 126 g of H₂O

                125 g                        -------------------------   x

                x = (125 x 126)/246

                x = 15750/246

               x = 64.02 g of H₂O

6 0
3 years ago
A nuclear waste site. cesium-137 is a particularly dangerous by-product of nuclear reactors. it has a half-life of 30 years. it
hram777 [196]
The mass decay rate is of the form
m(t) = m_{0} e^{-kt}
where
m₀ = 3000 g,the initial mass
k = the decay constant
t = time, years.

Because the half-life is 30 years, therefore
e^{-30k} =  \frac{1}{2} \\\ -30k = ln(0.5) \\ k =  \frac{ln(0.5)}{-30} =0.0231

After 60 years, the mass remaining is
m = 3000 e^{-0.0231*60} = 750 \, g

Answer: 750 g

4 0
3 years ago
Determine how many mm of Hg are equal to 5.3 atm of pressure
Leno4ka [110]
4028 mm of Hg...........
5 0
3 years ago
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