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3 years ago

An atom has 2 protons in its nucleus. Which of the following must be true for this atom to have no net electrical charge?

Chemistry

2 answers:

kobusy [5.1K]3 years ago

4 0

Answer:

The atom has 2 negatively charged electrons outside the nucleus.

Explanation:

done the topic it is correct

sp2606 [1]3 years ago

3 0

The 2 correct options I guess are A and D

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1. For dry air at 1.0000 atm pressure, the densities at –50°C, 0°C, and 69°C are 1.5826 g dm–3 , 1.2929 g dm–3, and 1.0322 g dm–

pshichka [43]

Answer :

(a) The value of volume of air at temperature $-50^oC,0^oC\text{ and }69^oC$ are $631.87dm^3,773.46dm^3\text{ and }968.80dm^3$ respectively.

Explanation :

(a) The formula used for density is:

$Density=\frac{Mass}{Volume}$

or,

$Volume=\frac{Mass}{Density}$

Now we have to calculate the volume at each temperature.

The mass of sample = 1000 g

At temperature $-50^oC$ :

Density = $1.5826g/dm^3$

$Volume=\frac{1000g}{1.5826g/dm^3}=631.87dm^3$

At temperature $0^oC$ :

Density = $1.2929g/dm^3$

$Volume=\frac{1000g}{1.2929g/dm^3}=773.46dm^3$

At temperature $69^oC$ :

Density = $1.0322g/dm^3$

$Volume=\frac{1000g}{1.0322g/dm^3}=968.80dm^3$

8 0

3 years ago

Answer fast my H.W is hard

Marina86 [1]

Answer: The molality of $MgF_2$ solution is 4.013 m

Explanation:

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg.

The formula used to calculate molarity:

.....(1)

Given values:

Given mass of $MgF_2$ = 20.0 g

Molar mass of = 62.3 g/mol

Mass of solvent = 80.0 g

Putting values in equation 1, we get:

$\text{Molality of }MgF_2=\frac{20.0\times 1000}{62.3\times 80.0}\\\\\text{Molality of }MgF_2=4.013m$

Hence, the molality of $MgF_2$ solution is 4.013 m

3 0

2 years ago

Which of the following substances can be decomposed by chemical change?

vovangra [49]

NaCl can be decomposed by electrolysis

Na, Cl2 and K are in the simplest form and they cannot be decomposed

8 0

3 years ago

The ratio of the mass of a substance to its volume is called___. Fill in the blank

FrozenT [24]

Answer: density

Explanation:google

Answer : The ratio of the mass of a substance to its volume is called density. ... The unit of mass is gram (g) and the unit of volume is milliliter (ml). So, the unit of density is g/ml.

8 0

2 years ago

How do we determine the number of electrons in a neutral atom?

Elodia [21]

this is the answer of your question .

Hope it helped you

3 0

2 years ago