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AfilCa [17]
3 years ago
6

MULTIPLE CHOICE

Chemistry
1 answer:
Reika [66]3 years ago
5 0

Answer:

iron #26, Cu #29, and mercury #80 are transition metals

Explanation:

MULTIPLE CHOICE

Question 3

ed

Which elements are transition metals?

Select all that apply.

A

iron

B.

magnesium

с

copper

D

mercury

look at a periodic table

columns 1,2,13,14,15,16, 17, and 18 are the "representative elements'

columns 3-12 are the transition metals

iron #26, Cu #29, and mercury #80 are transition metals

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When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 x 10-19 J. What is the frequency of th
jok3333 [9.3K]

When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

<h3>How to calculate the frequency of photon ?</h3>

To calculate the frequency of photon use the expression

E = hv

where,

E = Energy

h = Planck's Constant

v = frequency (Hz)

Put the value in above formula we get

E = hv

2.94 × 10⁻¹⁹ = 6.6 × 10⁻³⁴ × v

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  = 0.44 × 10¹⁵

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Thus from the above conclusion we can say that When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

Learn more about the Plank's Constant here: brainly.com/question/27163891

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2 years ago
How many moles of NaCl are equivalent to 15.6<br> grams of NaCl
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One mole of NaCl has a mass of approximately 58.5 grams. This gives it a conversion factor of 1/58.5

Hope This Helped

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