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quester [9]
3 years ago
11

An element has a mass number of 9 and 5 neutrons. What element is it?

Chemistry
2 answers:
Radda [10]3 years ago
7 0

Answer:

Fluorine

Fluorine is the element in question, as its atomic number is 9 . You would name this particular isotope using the mass number. It would be called fluorine-19.

Rudik [331]3 years ago
6 0

Answer:

Fluorine

Fluorine is the element in question, as its atomic number is 9 . You would name this particular isotope using the mass number. It would be called fluorine-19.

Explanation:

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What are the solutions to the equation x2 + 4x + 5 = 0?​
dusya [7]

Answer:

-1, -4

Explanation:

x^2+4x+5=0

Factoring, you get:

(x+4)(x+1)=0

To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!

4 0
2 years ago
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A diamond’s density is 3.2 g/cm3. <br> Determine the volume of a diamond that has a mass of 1 g.
svetlana [45]

Answer:

https://socratic.org/questions/diamond-has-a-density-of-3-52-g-ml-what-is-the-volume-in-cubic-centimeters-of-a-

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3 years ago
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For the gas phase decomposition of t-butyl propionate,C2H5COOC(CH3)3 (CH3)2C=CH2 + C2H5COOHthe rate constant at 540 K is 8.90×10
kvv77 [185]

Answer:

The activation energy is 164.02 kJ/mol

Explanation:

Log (k2/k1) = Ea/2.303R × [1/T1 - 1/T2]

k1 = 8.9×10^-4 s^-1

k2 = 9.83×10^-3 s^-1

R = 8.314 J/mol.K

T1 = 540 K

T2 = 578 K

Log (9.83×10^-3/8.9×10^-4) = Ea/2.303×8.314 × [1/540 - 1/578]

1.043 = 6.359×10^-6Ea

Ea = 1.043/6.359×10^-6 = 164020 J/mol = 164020/1000 = 164.02 kJ/mol

6 0
3 years ago
Do electrons fill up the lowest or highest level
OLEGan [10]
The electrons begin at the lowest level, and then fills up until it reaches the highest level, and completely fills the outer shell.
5 0
2 years ago
What is the wavelength of a 229 Hz sound wave moving at a speed of 345 m/s?
ANTONII [103]

Answer:

wave length=speed/frequency

=345/229

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