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mezya [45]
3 years ago
8

What is the moden periodic law​

Chemistry
1 answer:
Zarrin [17]3 years ago
5 0

Answer:

Here's what I get  

Explanation:

The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.

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One of the emission spectral lines for Be3+ has a wavelength of 253.4 nm for an electronic transition that begins in the state w
4vir4ik [10]

Answer:

4

Explanation:

Relationship between wavenumber and Rydberg constant (R) is as follows:

wave\ number=R\times Z^2\frac{1}{n_1^2} -\frac{1}{n_1^2}

Here, Z is atomic number.

R=109677 cm^-1

Wavenumber is related with wavelength as follows:

wavenumber = 1/wavelength

wavelength = 253.4 nm

wavenumber=\frac{1}{253.4\times 10^{-9}} \\=39463.3\ cm^{-1}

Z fro Be = 4

39463.3=109677\times 4^2(\frac{1}{n_1^2} -\frac{1}{5^2})\\39463.3=109677\times 16(\frac{1}{n_1^2} -\frac{1}{5^2})\\n_1=4

Therefore, the principal quantum number corresponding to the given emission is 4.

6 0
3 years ago
How does carbon dioxide get into the atmosphere?
e-lub [12.9K]

Answer:

By condensation.

Explanation:

Have a nice day dear

3 0
2 years ago
Read 2 more answers
How many grams are there in 1.1 x 1027 molecules of water (H2O)?
Nezavi [6.7K]

Answer:

C) 3.3 x 104 grams

Explanation:

1 mole of water contains 6.02 × 10^23 atoms

1.1 × 10^27 atoms will contain;

1.1 × 10^27 ÷ 6.02 × 10^23

= 0.1827 × 10^( 27 - 23)

= 0.1827 × 10^(4)

= 1.827 × 10³ moles of water.

To convert mole to mass in grams, we use the formula;

mole (n) = mass (m) ÷ molar mass (MM)

Molar mas of water (H2O) = 1(2) of H + 16 of O = 18g/mol

mole = mass/molar mass

1.827 × 10³ = mass / 18

mass = 1.827 × 10³ × 18

mass = 32.886 × 10³

mass = 3.286 × 10⁴

mass = 3.3 × 10⁴ grams

6 0
2 years ago
Which symbol is generally used to represent a sugar in simple models of nucleotides?
Bumek [7]
The sugar that occurs in nucleotides tends to be a 5 carbon sugar called ribose or deoxyribose and tends to be represented by a pentagon of 5 carbons joined to oxygen and OH to form part of the helix forming nucleic acids. The nucleotides are what constitutes the DNA and RNA which control genetic characteristics.
3 0
3 years ago
How many liters are there in 3.49 x 10^22 molecules of O2 at STP
Sholpan [36]

Answer:

I think 767.8

Explanation:

I first did 10 times 22 bc that little carrot sign means squared so I did 10 times 22 and that equaled 220, then I did 3.49 times 220 and that is the answer which is 767.8

5 0
3 years ago
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