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Luba_88 [7]
3 years ago
8

What is a proper adjective?

Chemistry
1 answer:
Alex17521 [72]3 years ago
7 0
This is what a proper adjective is.

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Rhenium (Re) is made up of 37.4% 185Re and 62.6% 187Re. The atomic mass of 185Re is 184.953 amu. The atomic mass of 187Re is 186
Anna007 [38]
To calculate the average mass of the element, we take the summation of the product of the isotope and the percent abundance. We calculate as follows:

Average atomic mass = .374 ( 184.953 amu ) + .626 ( <span>186.958 amu )  = 186.208 amu

Hope this answers the question. Have a nice day.</span>
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3 years ago
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Blank are produced when atoms if the elements in group 7A blank an electron​
Romashka [77]

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Halide ions are produced when atoms of elements in Group 7A gain an electron.

Explanation:

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10. What is one radioactive element that is used ir nuclear power plants?​
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Radium is an element used
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PLEASE HELP ANYONE IM TOO DUMB TO ANSWER THESE :(
AlladinOne [14]

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The "2" applies only to the sodium, and sugar is a substance

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The amount of atoms in an element are written using small letters after the element they refer to.

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3 years ago
How do scientists design roller coasters without using an engine?
NemiM [27]

Answer:

Before a rollercoaster ride begins, an electric winch winds the cars to the top of the first hill. That can take a while, because some rollercoasters start off nearly 100m (330ft) in the air!

The winch has to use energy to pull the rollercoasters up the hill, but that energy doesn't simply disappear. The rollercoaster cars store it just by being up in the air—and the higher up they are, the more energy they store. They'll use the same energy to race back down the hill when the ride begins. Because they have the ability (or potential) to use in the future energy that was stored in the past, we call the energy they're storing potential energy.

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