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Gennadij [26K]
3 years ago
9

What is the number of the group that has the most reactive nonmetals (give number and letter- Ex 1A, 2A, etc.)?​

Chemistry
1 answer:
Kryger [21]3 years ago
3 0

Answer:

Group 7A

Explanation:

The group 7A elements consists of the most reactive non-metals on the periodic table.

This group is known as the group of halogens. They consist of element fluorine, chlorine, bromine, iodine and astatine.

  • The elements in this group have the highest electronegativity values.
  • They have 7 valence electrons and requires just one electron to complete their octets.
  • This way, they are highly reactive in their search for that single electron.
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What is the electron configuration of the element in group 13 and period 3 on the periodic table? *
tankabanditka [31]

Answer:

The 3rd option is correct

Explanation:

The element in group 13 and period 3 is aluminium which has the electron configuration

1{s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}

or [Ne] 3s^2 3p^1

4 0
3 years ago
Calculate the percent error if the experimental value for the density of zinc is 9.95g/cm3, but the accepted value is 7.13g/cm3
Pani-rosa [81]
In order to calculate the experimental percent error, we follow these steps:
1- Subtract one value from the other (order does not matter as we take absolute)
2- Divide the obtained number by the accepted or true value.
3- Multiply the fraction you got from step 2 by 100 to get the percentage of error.

Now, we will apply these steps on our problem:
1- Subtract one value from the other:
9.95 - 7.13 = 2.82
2- Divide by accepted value:
2.82 / 7.13 = 0.3955
3- Multiply by 100 to get the error percentage:
error percentage = 0.3955 x 100 = 39.55%
7 0
3 years ago
How many liters are in a 0.115 M solution containing 1.55 moles of dissolved KBr?
Anika [276]
13.48 is your answer.

M=moles/liters we have M=.115 and moles=1.55

Input those values into the equation
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Solve for L
1.55/.115=13.48
5 0
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What does the photoelectric effect show about the properties of light?
mart [117]

Answer:

The photoelectric effect proves that light has particle-like activity,The photoelectric effect happens when photons are shone on metal and electrons are ejected from the surface of that metal.

Explanation:

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