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2 years ago

Why are group viia elements very active nonmetals

1 answer:

7 0

I’m not sure what you’re asking but- halogens are among the most active nonmetals due to their electron configuration and number of valence electrons.

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Help please help help

dusya [7]

Answer:

Which one? 1, 2, 3, 4 ,5, 6, or 7?

Explanation:

4 0

3 years ago

When performing a flame test using the method described in the manual, you complete the flame test of KNO3 and find a yellow col

jolli1 [7]

Answer:

The nichrome wire is dirty.

The solution is contaminated.

Explanation:

If the nichrome wire is dirty, it may contain sodium contaminants which may be responsible for the yellow flame. The nichrome wire is first inserted into the flame without the sample to check for impurities.

The test solution may also have been contaminated. This leads to the appearance of a colour different from the expected colour of the test cation in the solution.

7 0

3 years ago

Please fill out completely for my understanding. Thank-You!

Archy [21]

The atomic number,atomic mass,valence electrons and the formula for calculating the number of neutrons is also given.The following table has been completed below in the attachment.

Explanation:

Atomic Number:the number of protons /electrons present in the nucleus of an atom is called the atomic number.

Mass Number/Atomic Mass:the number of protons and neutrons present in a nucleus

Example: $C_{6} ^{12}$ ;here;6 implies the atomic number and 12 implies the mass number/atomic mass

No.of neutrons=Mass number-Number of protons

Valence electrons:the number of electrons present in the outer most shell of an atom are called valence electrons

Example:If we consider a carbon atom;as its electronic configuration is2,4 and it belongs to 4th group.Therefore the number of valency electrons in carbon is 4.

8 0

2 years ago

Convert 31.9 g of N2 to moles

pashok25 [27]

Answer: 1.14mol

Nitrogen molar mass=14g/mol

N2 molar mass=14*2=28g/mol

31.9g(1/28)=1.14mol N2

5 0

3 years ago

Otra manera para llamar la aceleración negativa es_______

enyata [817]

Answer:

creo que es cinemática, eso creo

8 0

2 years ago