Homework Help?!Please!!?

Question

I need help with my childs homework.
any answers would be helpful!!=D

11) When two nonmetal atoms are bonded together the result is a(an)____________.

12)The Family of_____________ is the most reactive group of metals in the periodic table.

13)The____________and the_____________ are shown at the bottom of the periodic table in order to keep the table at a reasonable size.

14) A mixture of metals is called a(an)____________.

15)The ____________ family is a very reactive group of mostly nonmetals whose atoms have 7 valence electrons.

True or False:(if false change sentence so its true)

18) The mass of a proton is about one atomic mass unit.

19) The reactivity of the metal elements generally increases as you move from left to right across the periodic table.

20)Helium nuclei and energy are the products of the nuclear fusion of the suns hydrogen.

21) What is a supernova and how is it related to the matter found on earth?

Answer 1

11) covalent bond
12) alkali metals
13) lanthanides, actinides
14) alloy
15) halogens
18) true
19) The reactivity of metal elements generally DECREASES as you move from left to right across the periodic table.
20) true
21) A supernova is an star exploding, essentially, releasing all its mass into the surrounding space. [And, I really doubt this is what you're looking for but...] Metal isotope "signatures" can be found in rock strata on earth, showing past supernovae. There is iron enrichment on the floor of the ocean as well.

Answer 2

11) covalent bonds
12)alkali metals
13)lanthanides and Actinides
14)compounds
15)halogens
18)true
19)false reactivity=atomic mass
20)true
21) supernova (plural: supernovae) is a stellar explosion which produces an extremely luminous object that is initially made of plasma—an ionized state of matter. A supernova may briefly out-shine its entire host galaxy before fading from view over several weeks or months. It would take about 10 billion years for the Sun to produce the energy output from the supernova explosion of a massive star.like a fission reaction on earth

Answer 3

11. These make a covalent bond because they share electrons rather than transfer them.
14. A mixture of metals is an alloy.
19. This is false. It decreases.
20. True.
21. I don't know what they want on this one.

Answer 4

11) compound?
12)alkali metals?
13)lanthanide series and actinide series
14)mixture?
15)Hallogins
18)true
19)false?
20)ummm well go with false
21)i think supernova is the amount of heat energy the sun generates

Answer 5

T+B+J=47 B=J-4 T=J+3 Plug in the second and third equations into the first equation. (J+3)+(J-4)+J=47 3J-1=47 3J=48 J=16* Plug J into the other equations. B=(16)-4 B=12* T=(16)+3 T=19*