NEED HELP FAST! 20 POINTS!! Light from the sun travels through space to Earth as transverse waves. These light waves DO NOT need a medium in which to travel. Think about the path that the light from the sun takes to shine through your Window.
How did that sunlight reach us all the way here on Earth? What does it travel through?

Since light waves can travel through an empty vaccum (which is what it is happening in this scenario) the sun radiates the light to us even though it takes 8 minutes to get here

also think of a lamp or a light on the ceiling as soon as you turn it on the light comes on to and if you were to put your hand on the light when it is on you will feel heat and the suns rays work the same way

It travels through the sun

The answer is true for your question.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.