Some questions for Chemistry?

[colordip13]

How many significant figures are in each of the following numbers?
a) 2.0324 b) 2300 c) 0.0650
2. Name an element that is found in the following families. a) halogen b) noble gas c) alkali metal d) transition metal
3. The nucleus of an atom contains what subatomic particles?
4. How many protons does each of the following elements have? a) oxygen b) copper c) gold
5. How many neutrons does each of the following elements have? a) lithium b) sodium c) oxygen
6. Describe two properties of metals. Where are they located on the periodic table?
7. Will the color of the flame of sodium nitrate be the same as the color of sodium chloride? Why or Why not?
8. How do you choose which variable should go on the x-axis and which one should to on the y-axis?
9. Tell me two things that Rutherford learned about the atom when he did his famous gold foil experiment.
10. Tell me how fusion and fission are different?
11. What is the periodic trend for the following? a) atomic radius b) electronegativity c) ionization energy
12. What is a photon?

 

[NMilutinovic]

2.)a)Cl b)Ne c)K d)Mn
3.)proton, neutron, electron
4.)a)8 b)29 c)79
5.)a)4 b)12 c)8
6.)left side of table, mostly silver, often ductile
7.)Yes, they both contain the same cation
8.)Dependant variables go on the y-axis
9.)There was a solid core(nucleus) that caused the alpha particles to repel, most of the atom was empty space
10.)Fusion is the process of combining two or more particles to form one particle, fission is the opposite
11.)a)stays the same along a period; gets bigger down a group b) increases diagonally from cesium to fluorine c) decreases
12.)A particle (energy package) that is seen as light

 

[Dany]

1.Sorry,but I don' understand your question.
2. a) Fluorine b)Helium c)Sodium d)Gold
3.protons and neutrons
4.a)8 b)29 c)79
5.a)4 b)12 c)8
6. good heat conductibility , good electrical conductibility. They are located to the left side of the periodic table.
7.Yes,because the same sodium ions (which excited by heat give the colour) are present in both compounds.
8.D.K.
9. 1)He learned that the atom has a nucleus. 2)He learned that outside the nucleus the atom was mostly empty space.
10.Fusion is the process by which atomic nuclei join together to form a heavier nucleus by absorbing or releasing energy. Fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts producing free neutrons and lighter nuclei.
11.a)The atomic radius tends to decrease as one progresses across a period and usually increases while going down a group. b) Trend-wise, as one moves horizontally across a period in the periodic table, the electronegativity increases but Moving down a group, the electronegativity decreases. c)Trend-wise, the ionization potentials tend to increase while one progresses across a period but as one progresses down a group on the periodic table, the ionization energy will likely decrease.
12.A photon is an elementary particle, the quantum of the electromagnetic field and the basic "unit" of light and all other forms of electromagnetic radiation.