If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?
a. 54
b. 27
c. 100
d. 108
5. atoms that vary in the number of neutrons found in their nuclei are called
a. ions
b. neutrons
c. neutral atoms
d. isotopes
potassium has an atomic number of 19.
what is its electron configuration?
a. shells 1 and 2 are full, and shell 3 has nine electrons
b. shells 1, 2 and 3 are full and shell 4 has three electrons
c. shells 1, 2 and 3 are full and shell 4 has one electron
d. shells 1, 2 and 3 are full and no other electrons are present
which type of bond represents a weak chemical bond?
a. hydrogen bond
b. atomic bond
c. covalent bond
d. nonpolar covalent bond

1. The atomic number is equal to the number of protons in the nucleus, and the mass number is equal to the number of protons and neutros in the nucleus.

Therefore, to find the number of neutrons we must do mass number - atomic number, which equals 54.

Answer 1: a. 54

2. Atoms of a same element that have a different number of neutrons in the nucleus are called isotopes of an element.

Answer 2: d. Isotopes

3. Potassium has an electron configuration of , meaning that the first 3 shells are full, and that the last shell (4th one) has only 1 electron.

Answer 3: c. Shells 1, 2 and 3 are full and shell 4 has one electron.

4. An atomic bond isn't a specific bond, it's just a term. Polar covalent and non-polar covalent bonds are strong bonds, which leaves us with the hydrogen bonds, which are indeed the weakest bonds out there.

Answer 4: a. Hydrogen bond

Hope it helped,

BiologiaMagister

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.