All categories

3 years ago

How many protons, electrons, and neutrons does the following Isotope contain? 27Al 3+

1 answer:

3 0

Answer: Since the mass (27) is equal to number of protons + number of neutrons, then number of neutrons = 27 - 13 = 14. 3.

i hope this is what you wre looking for :) .

You might be interested in

Which of the following is the most electronegative element?

Kipish [7]

None of these; the most electronegative element is fluorine because an atom of fluorine needs an additional electron to join it's outer membrane, so the atom can achieve stability.

a flourine atom on its own is always a negative ion.

7 0

3 years ago

How much heat is released when 6.00 g of methane is combusted using the reaction below? CH4 + 2O2 ? CO2 + 2H2O ?Hrxn = -890. KJ

goblinko [34]

Answer : The amount of heat released is, -121.04 KJ

Solution : Given,

Enthalpy of reaction, $\Delta H_{rxn}$ = -890 KJ

Mass of methane = 6 g

Molar mass of methane = 44 g/mole

First we have to calculate the moles of methane.

$\text{Moles of methane}=\frac{\text{Mass of methane}}{\text{Molar mass of methane}}=\frac{6g}{44g/mole}=0.136moles$

The given balanced reaction is,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

From the balanced reaction we conclude that

1 mole of methane releases heat = -890 KJ

0.136 moles of methane releases heat = $\frac{0.136moles}{1mole}\times -890KJ=-121.04KJ$

Therefore, the amount of heat released is, -121.04 KJ

8 0

3 years ago

Read 2 more answers

Which list of atomic model descriptions represents the order of historical development

Ilya [14]

Answer:

percocets

Explanation:

deals wit pain help with healing

5 0

3 years ago

Which of the following is an example of a chernical change?

matrenka [14]

Answer:

the chemical change occur in burning paper.

boiling water does not make any chemical change

melting gold "

dissolving sugar in water "

in these examples the reactant remains as the same , even if you melt gold it is gold itself, it only change its state.

7 0

4 years ago

Read 2 more answers

Electronegativity and ionization energy __________ from left to right within a period and __________ from top to

sergij07 [2.7K]

Answer:

C, increases/decreases

Explanation:

As you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus.

4 0

3 years ago