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3 years ago

What element has 2 electrons in its outermost energy level and is in the 2nd period on periodic table?

Chemistry

1 answer:

Olegator [25]3 years ago

4 0

Be-beryllium have 2 electrons and it is in the 2 nd period

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Una muestra de 2,5000 (g) de piedra caliza, se disuelve y se precipita el Calcio como oxalato de Calcio (CaC2O4), este precipita

sergij07 [2.7K]

Answer:

$\%Ca=19.378\%$

Explanation:

¡Hola!

En este caso, basado en la información dada, es posible conocer la masa de calcio en carbonato de calcio, que de hecho es la misma en la muestra, al utilizar el siguiente esquema de cálculo:

$m_{Ca}=1,2093gCaCO_3*\frac{1molCaCO_3}{100.1gCaCO_3}*\frac{1molCa}{1molCaCO_3}*\frac{40.1gCa}{1molCa}\\\\m_{Ca}=0.48444gCa$

Finalmente, calculamos el porcentaje requerido como sigue:

$\% Ca=\frac{0.48444g}{2.5000g} *100\%\\\\\%Ca=19.378\%$

¡Saludos!

4 0

2 years ago

____ is a poor conductor of heat A. aluminum B.iron C. ceramic D. zinc

Ganezh [65]

Your answer is ceramic.

8 0

3 years ago

How many valance electrons does He need to get to 8

mote1985 [20]

Answer:

Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons

5 0

2 years ago

FREE BRAINLIST NEED HELP ASAP

mixas84 [53]

Sulfur.
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7 0

2 years ago

A balloon of helium gas in Alabama has a volume of 22.4 L at 26°C and a 1.03 ATM how big with a balloon get if is transported to

Dimas [21]

Answer:

The final volume of the balloon is = 28.11 L

Explanation:

Initial pressure $P_{1}$ = 1.03 atm = 104.325 K pa

Initial temperature $T_{1}$ = 26 °c = 299 K

Initial volume $V_{1}$ = 22.4 L

Final temperature $T_{2}$ = 22 °c = 295 K

Final pressure $P_{2}$ = 0.81 atm = 82 K pa

We know that

$\frac{P_{1} V_{1} }{T_{1} } = \frac{P_{2} V_{2} }{T_{2} }$

Put all the values in above formula we get

$\frac{(104.325)(22.4)}{299} = \frac{(82)(V_{2} )}{295}$

$V_{2}$ = 28.11 L

This is the final volume of the balloon.

8 0

3 years ago