Question

1. name the element which has the following numbers of particles:

a. 26 electrons, 29 neutrons, 26 protons
b. 53 protons, 74 neutrons
c. 2 electrons (neutral atoms)
d. 20 protons
e. 86 electrons, 125 neutrons, 82 protons
f. 0 neutrons

1. if you know only the following information can you always determine what the element is? (yes/no)

a. number of protons
b. number of neutrons
c. number of electrons in a neutral atom
d. number of electrons

Explanation:

10.

a.

The number of protons determines the element. Since there are 26 protons, looking at the periodic table, the element is Iron (Fe).

b.

With 53 protons, referring to the periodic table, the element is Iodine (I).

c.

For a neutral atom, the number of electrons equals the number of protons. So with 2 electrons (and thus 2 protons), the element is Helium (He).

d.

20 protons correspond to Calcium (Ca) in the periodic table.

e.

The number of protons (82) determines the element. Looking at the periodic table, the element is Lead (Pb).

f.

The only element with 0 neutrons is Hydrogen (H).

11.

a.

The number of protons is unique to each element. So, if you know the number of protons, you can always determine the element. Answer: Yes.

b.

Different elements can have the same number of neutrons (isotopes of different elements can have same neutron count in some cases). So, knowing only the number of neutrons is not sufficient. Answer: No.

c.

For a neutral atom, the number of electrons equals the number of protons. Since the number of protons is unique to each element, knowing the number of electrons in a neutral atom allows determination of the element. Answer: Yes.

d.

If the atom is not neutral (i.e., it is an ion), the number of electrons does not equal the number of protons. So, just knowing the number of electrons (without knowing if it is a neutral atom) is not sufficient. Answer: No.

Answer:

10.
a. Iron (Fe)
b. Iodine (I)
c. Helium (He)
d. Calcium (Ca)
e. Lead (Pb)
f. Hydrogen (H)
11.
a. Yes
b. No
c. Yes
d. No