What is the formula for flow rate?

. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.

Marina86 [1]

Answer:

C

Explanation:

it belong to that group as it needs 1 electron to be chemically stable

7 0

3 years ago

Hellllppppp lons Worksheet

Iteru [2.4K]

The metals will lose electrons while the non metals will gain electrons in order to attain octet structure.

An ion can be cation (positively charged) or anion (negatively charged).

Cations attain octet structure (8) by losing electron(s) while anions become stable or attains octet structure (8) by gaining electron(s).

The remaining elements are completed as follows to attain octet structure;

Element--valence electron--electrons to gain--electrons to lose--ion formed

O ------------ 6 ---------------------- 2 ------------------------ none -------------- $O^{2-}$

Ca -------- 2 ----------------------- none ---------------------- 2 ------------------ $Ca^{2+}$

Br ----------- 7 --------------------- 1 ------------------------ none --------------- $Br^{-}$

S ------------ 6 ----------------------- 2 ------------------------ none --------------- $S^{2-}$

Cl ------------ 7 ----------------------- 1 ------------------------ none ---------------- $Cl^{-}$

K -------------- 1 ----------------------- none ----------------------- 1 ------------------ $K^{+}$

Mg ------------ 2 ---------------------- none ---------------------- 2 ---------------- $Mg^{2+}$

Be ------------- 2 ---------------------- none ---------------------- 2 ---------------- $Be^{2+}$

Learn more here: brainly.com/question/21089350

8 0

3 years ago

Please answer, please answer please answer please answer my last 2 chemistry question.

scoundrel [369]

Answer:

1. filtration and evaporation

2. i) water is added to the sand and salt mixture

ii) then the mixture is filtrated and so the sand and the salt water was seperated

iii) the salt water is heated with the help of burner until the water gets evaporated

iv) after the water gets evaporated, the salt is remained in the container

3. observation:

on adding water to the mixture, the salt is completely dissolved in the water
when filtrated the sand is seperated from the salt water
now the salt water when heated with the burner until the evaporation, the water is evaporated
the salt is precipitated and remained in the container

4. cautions:

while using the burner, we should be cautious with fire
the container that is heated should be holded with the help of a cloth to avoid heat

7 0

3 years ago

Which of the following is a pure substance? Choose all that apply.

worty [1.4K]

Nickel is a pure substance

Rust is also a pure substance

7 0

3 years ago

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a chemist studies two forms of refined gasoline. which of the following branches of chemistry might the chemist us?

valentinak56 [21]

The branch of chemistry that the chemist might use will be the branch of organic chemistry. This is because gasoline is an organic compound. We can say that a compound is organic if it contains a carbon atom. Gasoline is composed of long chains of alkanes (hydrocarbons with single bonds) ranging from 4 carbon atoms to 12 carbon atoms.

3 0

3 years ago

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