PLS ANSWER (SCIENCE QUESTION) I WILL MARK U AS THE BRAINLIEST Q1. Fill in the blanks:
1. are the building blocks of matter.
2. Each has a chemical symbol.
3. is used in oxy- acetylene flame for welding.
4. Noble gasses are also called .
5. Dimitri Ivanovich Medeleeve arranged the elements systematically in
6. Elements are the simplest kind of __.
7. Metals have __ melting and boiling points.
8. As you move from the left side of the periodic table to the right side, the elements become .

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)