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Free_Kalibri [48]
3 years ago
12

Use the periodic table to give the name and symbol for each of the following elements:

Chemistry
1 answer:
Margarita [4]3 years ago
4 0

Explanation:

Noble gases are the gases which are present is group 18 of the periodic table.

(a) Sodium is the alkali metal that has 11 protons as its atomic number is 11. Sodium is present in group 1 and period 3 of the Periodic table. Therefore, noble gas present in period 3 is Argon.

(b) Argon is the noble gas that has 18 electrons and it is present in period 3. Hence, alkaline earth metal that is present in period 3 is magnesium.

(c) Manganese is the element that has atomic number (or protons) equal to 25 and its atomic mass (total protons + total neutrons) equal to 55. Manganese is present in period 4 and noble that is also present in period 4 is krypton.

(d) Gold is the element that is present in period 6. And, a noble gas which is also present in period 6 is Radon.

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Answer:

c.mass and distance

Explanation:

gravitation=mass/distance ²

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A green powder was placed into a beaker of water. After it was stirred the water looked cloudy and lumps of powder could still b
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2 years ago
EDTA EDTA is a hexaprotic system with the p K a pKa values: p K a1 = 0.00 pKa1=0.00 , p K a2 = 1.50 pKa2=1.50 , p K a3 = 2.00 pK
mihalych1998 [28]

Answer:

Check the explanation

Explanation:

When,

pH = -log[H+] = 3.30

[H+] = 5.0 X 10^{-4} M

Ka1 = 1 ; Ka2 = 0.0316 ; Ka3 = 0.01 ; Ka4 = 0.002 ; Ka5 = 7.4 X 10^{-7} ; Ka6 = 4.3 X 10^{-11}

alpha[Y^-4] = [H+]^6 + Ka1[H+]^5 + Ka1Ka2[H+]^4 + Ka1Ka2Ka3[H+]^3 + Ka1Ka2Ka3Ka4[H+]^2 + Ka1Ka2Ka3Ka4Ka5[H+] + Ka1Ka2Ka3Ka4Ka5Ka6

= 1.56 X 10^{-20} + 3.12 X 10^{-17} + 2 X 10^{-15} + 4 X 10^{-14} + 1.6 X 10^{-13} + 2.34 X 10^{-16} + 2 X 10^{-23}

= 2.02 X 10^{-13}

When,

pH = -log[H+] = 10.15

[H+] = 7.08 X 10^{-11} M

Ka1 = 1 ; Ka2 = 0.0316 ; Ka3 = 0.01 ; Ka4 = 0.002 ; Ka5 = 7.4 X 10^{-7} ; Ka6 = 4.3 X 10^-11

alpha[Y^{-4}] = [H+]^6 + Ka1[H+]^5 + Ka1Ka2[H+]^4 + Ka1Ka2Ka3[H+]^3 + Ka1Ka2Ka3Ka4[H+]^2 + Ka1Ka2Ka3Ka4Ka5[H+] + Ka1Ka2Ka3Ka4Ka5Ka6

= 1.26 X 10^{-61} + 1.8 X 10^{-51} + 8.1 X 10^{-43} + 1.12 X 10^{-34} + 3.17 X 10^{-27} + 3.3 X 10^{-23} + 1.83 X 10^{-23}

= 5.12 X 10^{-23}

4 0
3 years ago
Which of the following can undergo metamorphosis?
Vaselesa [24]

Answer: None of the above

Explanation: It is not possible for any of these animals to undergo metamorphosis.

6 0
3 years ago
Match each decimal number to the correct scientific notation.
Effectus [21]

3.07 × 10^4=30,700

3.07 × 10^-4=0.000307

3.07 × 10^-6=0.00000307

3.07 × 10^6=3,070,000



5 0
3 years ago
Read 2 more answers
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