#1: The atomic number of an atom is equivalent to which of the following?

A. the number of protons plus the number of neutrons in the nucleus

B. the number of electrons outside the nucleus

C. the number of protons in the nucleus

D. the number of neutrons in the nucleus
***my answer: C
is that right??

Question

#1: The atomic number of an atom is equivalent to which of the following?

A.       the number of protons plus the number of neutrons in the nucleus

B.       the number of electrons outside the nucleus

 C.      the number of protons in the nucleus

  D.     the number of neutrons in the nucleus
***my answer: C
is that right??

anonymous · Answer

#2: The mass number of an atom is equal to which of the following?

A.       the number of protons plus the number of neutrons in a nucleus

 B.      the number of protons in a nucleus

  C.     the number of protons plus the number of electrons in an atom

  D.     the number of electrons circling the nucleus of an atom
**My answer: A
is that correct?

aaronq · Answer

(Y) both are good

anonymous · Answer

#3:  A specific atom of molybdenum has an atomic number of 42 and a mass number of 96. How many protons are in this atom of molybdenum?

A.       21

 B.      42

  C.     54

   D.    96
**MY answer: B. 42

anonymous · Answer

#4: An atom of iridium has an atomic number of 77. There are 116 neutrons in the nucleus of a specific atom of iridium. What is the mass number of this atom of iridium?

A.       77

 B.      115

   C.    193

   D.    269
**MY answer: A. 77
I think its 77 but I'm not 100% sure :(

anonymous · Answer

#5: An electrically neutral atom of manganese has an atomic number of 25. How many electrons does this atom have?

A.       10

 B.      25

  C.       55

  D.     80
***My answer: B. 25
cuz electrons are neutral right?? so does that make the answer 25??? idk :(

anonymous · Answer

#6: In any electrically neutral atom, what is true of the number of electrons?

A.       It is half the number of protons in the nucleus

  B.     It is equal to the number of protons plus the number of neutrons.

   C.    It is equal to the number of protons in the nucleus.

   D.    It is equal to the number of neutrons in the nucleus.
**MY answer: C.

aaronq · Answer

#4 is incorrect.

mass number = amount of protons + amount of neutrons

#5 is correct. in neutral atom: protons = electrons

#6 is correct

anonymous · Answer

so what is the answer to #4??
is it D. 269
??

aaronq · Answer

noo.... 77 +116 = mass number

anonymous · Answer

ohh okay, so my answer is 193
so my answer is C. 193
???

aaronq · Answer

atomic number = # of protons

aaronq · Answer

yep! C

anonymous · Answer

awesome!! and everything else is right??

aaronq · Answer

yep!

anonymous · Answer

aweosme! thanks :)