Question

question 4
1 pts
protons are twice as massive as electrons.
true
false
question 5
1 pts
electrons are repelled by protons.
true
false
question 6
1 pts
a species contains 186 neutrons, 146 electrons and has a charge of -3. what is the atomic number of this species?

Explanation:

Question 4

The mass of a proton is about 1836 times the mass of an electron, not twice. So the statement is false.

Electrons have a negative charge and protons have a positive charge. Opposite charges attract, so electrons are attracted to protons, not repelled. Thus the statement is false.

Step1: Recall the relationship between charge, electrons, and protons.

The charge of an ion is given by the formula: $\text{Charge} = \text{Number of protons} - \text{Number of electrons}$. We know the charge is -3 and the number of electrons is 146. Let the number of protons be $p$. So, $-3 = p - 146$.

Step2: Solve for the number of protons.

To find $p$, we rearrange the formula: $p = 146 + (-3)= 143$? Wait, no, wait. Wait, the formula is $\text{Charge} = \text{Protons} - \text{Electrons}$. So if charge is -3, then $-3 = p - 146$. So $p = 146 - 3 = 143$? Wait, no, let's do it correctly. Let's re - arrange the equation: $\text{Protons}=\text{Electrons}+\text{Charge}$? Wait, no. Let's think again. The charge is (protons - electrons). So if the ion has a charge of -3, that means it has 3 more electrons than protons. So number of protons $=\text{Number of electrons}-\text{Magnitude of charge}$. So number of protons $= 146 - 3 = 143$? Wait, no, wait. Wait, the formula is: For a charged species, $\text{Charge} = n_p - n_e$, where $n_p$ is the number of protons and $n_e$ is the number of electrons. So if charge is -3, then $-3=n_p - 146$. So $n_p=146 - 3 = 143$? Wait, no, solving for $n_p$: $n_p=146+( - 3)=143$? Wait, no, $-3=n_p - 146$ implies $n_p = 146 - 3=143$. But the atomic number is equal to the number of protons. So the atomic number is 143. Wait, let's check again. If the charge is -3, the ion has gained 3 electrons. So the neutral atom would have $146 - 3 = 143$ electrons, and in a neutral atom, number of protons = number of electrons. So number of protons is 143, so atomic number is 143.

Answer:

False

Question 5