Answer:b) atoms
Explanation:which are in turn made up of protons, neutrons and electrons
Answer:
Its D Kr and Xe
Explanation:
Element from the same group have simmilar properties
If you now the atomic number ،its so easy to know how much electrons they have in outermost shell.
<u>Record of magnetic reversals recorded in molten rock at mid-ocean ridges:</u>
Often in ocean, at the junction of two plates, lava often comes out of the junction because of the movement of plates away from each other as a result, forming a divergent plate boundaries. As the lava comes up, the magnetic minerals come along with it.
During the molten state, they arrange themselves along the magnetic poles of the earth. Then they gets solidified. As the magnetic reversals take place in earth, these rock can’t change the orientation, but they retain the data about the magnetic orientation of earth corresponding to the date of their formation.
I believe the correct answer from the choices listed above is option 2. The isotope of an atom that contains <span>40 protons and 51 neutrons and suddenly has two neutrons added to it would be </span>Zirconium-93. We look at a periodic table <span>and find the element with the atomic number 40 which equal the number of protons.</span>
Use a little liquid dishwashing detergent (the kind you use for hand washing dishes) to pretreat the stains. Apply a few drops to each stain and let it soak in, rubbing it gently to help work it all the way in if you need to. Wait 5 minutes, and then rinse with warm water.