Atoms and Chemistry...?

Question

1. What element results if one of the neutrons in a nitrogen nucleus is converted by radioactive decay into a proton?

2. The atoms that constitute your body are mostly empty space, and structures such as the chair you're sitting on are composed of atoms that are mostly empty space. So why don't you fall through the chair?

3. If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of theis element?

4. Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?

Ha ha... you're funny!

No, I need a little shove in the right direction. Maybe someone knows of a website that has more info. than my book has...

Answer 1

1. An element is defined by the number of protons in its nucleus. The number of neutrons is completely irrelevant (atoms with different number of neutrons, but the same number of protons, are isotopes of the same element). So ask yourself these questions: How many protons does a nitrogen atom have? Which element has one more proton than nitrogen?

2. Electrostatic repulsion (forces between interacting molecules). I'll let you look up the details.

3. The approximate mass, in amu, is the number of neutrons plus the number of protons. Since you only want an approximation, don't worry about the electrons, which weigh 1000 times less than protons and neutrons. For the name of the element, remember what I said in question #1.

4. The molecular weight of C-12 is 12 g/mol. So 1 g of C-12 contains 1/12 moles C-12. Likewise, 1 g of C-13 contains 1/13 moles C-13. And you also know that the number of atoms in a mole is always the same (Avogadro's number), so which of the above has more atoms?

Answer 2

we've in no way considered an atom, yet for the time of heritage we've detected that it really is there and we are nevertheless gaining awareness of about what it really is exactly. undergo in recommendations on your chemistry type about all those heritage training, like the plum pudding style? it really is complicated to placed a image to at least some thing we received't see, yet human beings were attempting to for a lengthy time period and we've managed to do quite properly so a strategies. contraptions were engineered for the only objective of detecting different factors. yet yeah, there are such truly some diverse historic discoveries bearing on to the atom. i do not understand everybody's call, notwithstanding it will be appeared up. it really is astounding how human beings have got here upon the elements of an atom, its weight, and its value. So once you have an interest in the life of an atom, pay interest to those heritage training on your chemistry type like the gold foil try and stuff.

Answer 3

3. The approximate molar mass is the sum of the neutrons and protons, as they are approximately equal in weight, and that is what the atomic mass is based on.

Answer 4

Do you have a specific question about atomic structure, or just want someone to do your HW for you?