As the atomic mass of the elements in the periodic table increase, what happens to the following?

Question

As the atomic mass of the elements in the periodic table increase, what happens to:

1. The number of atoms in 1 mol of each element?

2. Protons

3. Electrons

Answer 1

1. Stays the same, a mol is a mol is a mol...
2. Goes up, that's why it's heavier (and some neutrons).
3. Goes up, to match the protons.

Answer 2

1. The number of atoms in 1 mol of the element doesn't change. (A mole always contains 6.02 x 10^23 of whatever object you're counting.) However, the number of atoms in 1 GRAM of the element would be decreasing as the atomic mass increases.

2&3. In general, the number of protons and electrons increases as the atomic mass increases, but this isn't rigorously true. That's because the number of neutrons in an atom also affects the atomic mass. For an example of two elements that go against the general trend, take a look at cobalt (Co) and nickel (Ni). Co has a slightly higher atomic mass than Ni, even though it has one fewer electron and proton.

Answer 3

Almost, staceydangerfield...

1) Nothing. The number of atoms in 1 mol of a substance will never change. Remember, a mol is just a number of objects (not volume):
1mol(substance) = 6.02x10^23(substance)

2) Increases. Atomic mass is related to the number of protons (and neutrons) therefore if the mass goes up, then the number of protons did as well.

3) Increases. Assuming the atoms are neutral, the number of electrons must equal the number of protons. If protons increase, so do electrons.

Hope this helps.

Answer 4

1 mole of any substance has a number of 6.02 x 10^23. This is known as the Avogadro's constant.
Hence for Q1, the number of atoms in 1 mol of each element should remain the same (i.e. 6.02 x 10^23).

Q2. Elements in Periodic table are arranged in increasing proton numbers. Hence the number of protons should increase.

Q3. Since the number of electrons in an atom is equivalent to the number of protons in that atom, the number of electrons should also increase.

By the way, an atom is neutral hence the number of oppositely-charged charged particles (meaning the positively-charged protons and the negaticely-charged electrons) should be the same, so that they can cancel out each other.

Answer 5

1. the number of atoms in one mol remains the same. a mol contains 6.012* 10^23 atom irrespective of the atomic mass.
2. the number of protons increase . ( they contribute to atomic mass alongwith the neutrons)
3. the electrons also increase to remain equal to the protons( for neutrality of an atom)

Answer 6

The best answer here is A) - a beta particle (which is an electron). If a neutron in the nucleus absorbs sufficient energy it can decay into a proton and an electron. If the electron is ejected, the proton remains behind, thus increasing the proton number (or atomic number) of the nucleus by 1.

Answer 7

1. gets smaller (the atom is getting bigger therefore less and less can fit in that mol)
2. protons increase
3. electrons increase