Chemistry

Number of protons + Number of electrons

Number of protons + Number of neutrons

Number of electrons + Number of neutrons

Number of protons - Number of neutrons

I don't care about that.

192.23

191.77

191.77 amu

192.23 amu

What is it so hard?

0.785

14.17

7.85

17.61

I have no calculator.

180 g

300 g

75 g

150 g

I don't know.

2.04 x 10^-27 J

4.89 x 10^-18 J

4.89 x 10^-26 J

2.04 x 10^-18 J

I have no idea.

Why there are so many pictures?

1s²2s²2p⁶3s²3p⁶4s²3d⁵

1s²2s²2p⁶3s²3p⁶4s¹3d⁵

1s²2s²2p⁶3s²3p⁶3d⁶

1s²2s²2p⁶3s²3p⁶4s²3d⁴

This question is so confusing.

I'm losing my mind right now.

Trigonal Bipyramidal.

Trigonal Planar.

Trigonal Pyramidal.

Tetrahedral.

Me.

π bond formed from the overlapping sideway of s orbital and p orbital.

π bond formed from the overlapping of s orbital and p orbital.

π bond formed from the overlapping end to end of two p orbital.

π bond formed from the overlapping sideway of two p orbital.

Nothing I can say.

Ethanol can form hydrogen bond between their molecules and water molecules.

Ethanol can form van der Waals forces between their molecules and water molecules.

Ethanol can form hydrogen bond between their molecules.

Density of water is higher than density of ethanol.

I cannot even guess the answer.

Electrostatic attraction between the positively charged metal ions and the "sea of delocalized" valence electrons.

Dispersion forces are caused by the motion of electron in a molecule or atom.

Attractive force between polar molecules.

Force between polar molecules which have partially positive H atom bonded to highly electronegative atom N, O or F.

I don't recognize it.