3 years ago

40 Points Need help ASAP

1 answer:

3 0

It requires a force in the direction opposite to the motion of the object for it to slow down.

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Blababa [14]

2 stands for valency of ca ion

its +2

that it takes two electrons to complete its shell

8 0

3 years ago

Mariulka [41]

Answer:

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

Explanation:

Wavelength of the photon emitted = $\lambda =646.3 nm =646.3\times 10^{-9} m$

Energy of the photon will corresponds to the energy difference between 2p and 2s orbital = E

Energy of the photon is given by Planck's equation:

$E=\frac{hc}{\lambda }$

h = Planck's constant = $6.626\tiomes 10^{-34} Js$

c = Speed of the light = $3\times 10^8 m/s$

$E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}$

$E=3.07\times 10^{-19} J$

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

3 0

3 years ago

Veronika [31]

b,f,h are already balanced

7 0

3 years ago

natima [27]

Answer:

whats the answer

Explanation:

4 0

3 years ago

Sliva [168]

All done no worries

5 0

3 years ago