Question

I'm doing Science right now. I have the answers down for most of them but I'm not sure if I am right..... Can u pls help me and tell me if my answers r right? I suck at science :S

1.A
2.C
3.B
4.D
5.D
6.A
7.?
8.A
9.E
10.C
11.A
12.D
13.C
14.B
15.?
16.?
17.?
18.E
19.D
20.E



1. The positively charged particle in an atom:

A. proton
B. neutron
C. electron
D. pion
E. gluon


2. The negatively charged particle in an atom:

A. proton
B. neutron
C. electron
D. pion
E. gluon


3. The largest particle in an atom:

A. proton
B. neutron
C. electron
D. pion
E. gluon


4. Tiny particles that can be exchanged by protons and neutrons:

A. alpha particles
B. quarks
C. electrons
D. pions
E. gluons


5. Tiny particles that can be emitted by neutrons to form protons:

A. alpha particles
B. quarks
C. gluons
D. beta particles
E. photons


6. An isotope remains unchanged by the emission of a gamma ray, which is a(an) __________.

A. alpha particle
B. quark
C. gluon
D. beta particle
E. photon


7. An unstable isotope is transformed into a different element by the emission of a(n)__________.

A. alpha particle
B. quark
C. gluon
D. gamma ray
E. photon


8. A hydrogen atom with no electron is the same as a __________.

A. proton
B. neutron
C. photon
D. pion
E. beta particle


9. A helium-4 atom with no electrons is the same as a(an) __________.

A. proton
B. neutron
C. photon
D. pion
E. alpha particle


10. A gamma ray is pure __________.

A. magnetism
B. mass
C. energy
D. all of the above
E. none of the above


11. Niels Bohr is known for his model of the:

A. atom
B. atomic nucleus
C. simple electron orbit
D. all of the above
E. none of the above


12. The very complex __________ corrects the oversimplifications of the Bohr model.

A. Rutherford model
B. relativity model
C. Newtonian model
D. quantum-mechanical model
E. none of the above


13. The errors of the Bohr model center around the treatment of the:

A. protons
B. neutrons
C. electrons
D. quarks
E. none of the above


14. The number of protons in the nucleus of an atom:

A. atomic mass
B. atomic number
C. isotope number
D. half-life number
E. none of the above


15. The total number of protons and neutrons in the nucleus of an atom:

A. mass number
B. atomic number
C. isotope number
D. half-life number
E. none of the above


16. Radioactive decay occurs as __________.

A. alpha decay
B. beta decay
C. gamma decay
D. all of the above
E. none of the above


17. Radioactive decay occurs in an atom that has a(n) __________.

A. unstable nucleus
B. unstable electron shell
C. excess of electrons
D. deficit of electrons
E. none of the above


18. The rate of radioactive decay is measured in terms of __________.

A. isotopes
B. grams
C. rads
D. roentgens
E. half-life


19. Assuming that the half-life of a radioactive substance is 10 years, how much of the original substance will remain after 20 years?

A.100%
B. 75%
C. 50%
D. 25%
E. zero


20. Radioactive dating using ^14C (carbon isotope 14) has been shown to be inaccurate due to differences in ^14C found in __________.

A. dinosaur bones
B. rock strata
C. igneous rock
D. sedimentary rock
E. none of the above

Answers

scott
6) gamma is electromagnetic radiation

7) helium nucleus

11) electrons

15) total mass

16) more than one

17) instability
Osprey
1 correct
2 correct
3 correct
4 correct
5 correct
There's the first 5.... I'll check the others when i get some sleep....
barnyard-gal
@scott

I don't understand your answers. None of the ones you gave me match the multiple choice answers. Are you giving me wrong answers on purpose or.....?

@Osprey

Oh, okay..... Yeah, lol. I should get some too.

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