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4 years ago

CHEM FINAL PLEASE HELP

Chemistry

1 answer:

marta [7]4 years ago

5 0

Answer:

Potassium (K) and Fluorine (F)

Explanation:

A salt is formed with a metal and non-metal element from the periodic table of elements. if you look at the online ptable.com the upper right hand corner of each element shows the valence electrons for each element, and how many are in each shell for that element. Fluorine (F) has 7 valence electrons in its outer most shell, which means there is room for 1 more electron since the second shell can hold a max of 8. Potassium(K) has 1 electron in its outer most shell- which means is can fill in the 1 space available that fluorine has in its outer most shell. Since Potassium(K) is a metal and Fluorine(F) is a non-metal they can form an ionic compound, salt.

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Iodine-131 is one of the most important isotopes used in the diagnosis of thyroid cancer. One atom has a mass of 130.906114 amu.

Vera_Pavlovna [14]

Iodine-131 is one of the most important isotopes used in the diagnosis of thyroid cancer. One atom has a mass of 130.906114 amu.

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2 years ago

Helium is in group 18 of the periodic table. How is helium different from the other elements in this group?

pishuonlain [190]

Answer:

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Explanation:

7 0

3 years ago

Dau 5 stele celui care imi zice de ce sunt mai multe lumini pe suportul de deasupra mesei deoperatie

egoroff_w [7]

I really don't know so sorry

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3 years ago

TWO QUESTIONS! NEED HELP PLEASEEE

castortr0y [4]

First question I believe is B

The second one is also B

I really hope it helped

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4 years ago

Which of the following combinations can be used to prepare a buffer at ph 1

xeze [42]

A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.

<h3>What is a buffer?</h3>

A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.

Buffers are made from solutions of weak acids and their salts or weak bases and their salts.

The pH of a solution is the negative logarithm to base 10 of yhe hydrogen ion concentration of the solution.

Solutions of low pH have high concentration of hydrogen ions while solutions of high pH have high hydrogen ion concentration.

Learn more about about buffers and pH at: brainly.com/question/22390063

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3 years ago