Which of the following about sodium atoms (Na) is NOT correct?

1. All neutral sodium atoms have 11 protons
and 11 electrons.

2. All sodium atoms have the atomic number
11.

3. All sodium atoms have the same number
of protons.

4. All sodium atoms have 11 neutrons.

5. All atoms with atomic number 11 are
sodium atoms.

Which best describes how johannes kepler developed his laws of planetary motion

Why does his teacher ask him to balance the equation by including the correct coefficient

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.