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dalvyx [7]
3 years ago
9

Which is easier to remove: a valence electron from, Li or Na? Explain why.

Chemistry
1 answer:
scZoUnD [109]3 years ago
7 0

The atomic number of Li is 3

Electron configuration of Li : 1s² 2s¹

The atomic number of Na is 11

Electron configuration of Na : 1s²2s²2p⁶3s¹

Thus there is one electron in the valence shell of Li (2s¹) and that of Na (3s¹). However, the valence electron in Na is in a shell that is farther away from the nucleus compared to that of Li. As a result, the Na valence electron will be held less tightly by the nucleus i.e. it will experience a reduced nuclear attraction and can be removed easily than the Li 2s electron.

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A carbon atom has six protons and six neutrons. What is its<br>atomic number?​
diamong [38]
Carbon always has six protons, as its atomic number is six. Carbon twelve would have six neutrons (six protons plus six neutrons) in the nucleus of the atom. So the atomic number is 12
7 0
3 years ago
Un medicamento corresponde a una disolución de "nafazolina" (sustancia activa) en agua purificada, en una concentración de 12% V
ratelena [41]

Answer:

12 mL

Explanation:

Según la pregunta;

V / V% concentración del fármaco = 12%

volumen de la solución = 100 ml

De;

V / V% = volumen de fármaco / volumen de solución

volumen de fármaco = V / V% × volumen de solución

volumen de fármaco = 12/100 × 100

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5 0
3 years ago
Which of these challenges is unique to the process of designing prostheses as opposed to engineering other technologies?
Nostrana [21]

Answer:

predicting how a tech will interact with human tissue.

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4 0
2 years ago
Convert 1.25 atm to bar.
Tasya [4]

Answer: 1.27 bar

Explanation:

1 atm = 1.01325 bar

1.25 atm = Z (let Z be the unknown value)

To get the value of Z, cross multiply

Z x 1 atm = 1.25 atm x 1.01325 bar

1 atm•Z = 1.2665625 atm•bar

To get the value of Z, divide both sides by 1 atm

1 atm•Z/1 atm = 1.2665625 atm•bar/1atm

Z = 1.2665625 bar

(Round up Z to the nearest hundredth as 1.27 bar)

Thus, 1.25 atm when coverted gives 1.27 bar

8 0
3 years ago
Please help this affects my grade a lot and im confused
IgorC [24]

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2) Calcium hydroxide react with phosphoric acid to produce calcium, hydrogen phosphate and water

Ca(OH)2 + H3PO4 → CaHPO4 + 2H2O

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3Cr2CuO7 + 2AsFeO4 → Cu3(AsO4)2 + Fe2(Cr2O7)3

Reaction Type : Double Displacement

4) aluminium hydroxide and hydrochloric acid react to form aluminium chloride and water

Al(OH)3 + 3HCl → AlCl3 + 3H2O

3 0
3 years ago
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