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DIA [1.3K]
2 years ago
10

4. Write the electronic configuration of first 20 elements in the periodic table.

Chemistry
1 answer:
DIA [1.3K]2 years ago
7 0

Answer:

Name Atomic Number Electron Configuration Period 1 Hydrogen 1 1s1 Helium 2 1s2 Period 2 Lithium 3 1s2 2s1 Beryllium 4 1s2 2s2 Boron 5 1s2 2s22p1 Carbon 6 1s2 2s22p2 Nitrogen 7 1s2 2s22p3 Oxygen 8 1s2 2s22p4 Fluorine 9 1s2 2s22p5 Neon 10 1s2 2s22p6 Period 3 Sodium 11 1s2 2s22p63s1 Magnesium 12 1s2 2s22p63s2 Aluminum 13 

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Explain how a heater warms the air in a room, including the words density, volume, and temperature in your explanation
seropon [69]

Answer:

Explanation:

Convection currents are created when the air above your radiator heats and then cools and is then heated again. This process happens continuously whilst you have your heating on and the current moves the heat around the room making it nice and warm and toasty.

8 0
2 years ago
what is ( H+) and (OH-) in a healthy person's blood that has a PH of 7.50 assume that the temperature of the blood is 298 K.
AlekseyPX

pH = - log [H⁺]

pH = 7.5

\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}

pH + pOH = 14

7.5 + pOH = 14

pOH = 6.5

\tt [OH^-]=10^{-6.5}=3.16\times 10^{-7}

5 0
2 years ago
What is the mass, in grams, of 1.15 mol of water, H2O?
garri49 [273]
M = n x Mr

Mr of H20 - 18.006

M = 1.15mol x 18.006g/mol
= 20.7069g
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8 0
2 years ago
What is the purpose of replication?
True [87]

Answer:

2-to produce copies of a DNA molecule

8 0
3 years ago
You are trying to determine how
ss7ja [257]

Answer:

0,218 moles

Explanation:

I will first explain how many liters is 256ml, that is 0,256 l.

because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)

To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.

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1 year ago
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