Which property do the elements in each column of the representative elements series of the periodic table have in common?
number of protons
number of protons
number of orbitals
number of orbitals
number of neutrons
number of neutrons
number of valence electrons
number of valence electrons
The property that the elements in each column of the representative elements series of the periodic table have in common is the number of valence electrons.
Which element has six valence electrons?
The element that has six valence electrons is oxygen (symbol: O).
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
The correct statement comparing the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca) is as follows:
- Rubidium (Rb): It has 37 protons and 37 electrons.
- Calcium (Ca): It has 20 protons and 20 electrons.
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
(1 point)
Responses
Rubidium has fewer protons and more electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has more protons and fewer electrons than calcium.
Rubidium has more protons and fewer electrons than calcium.
Rubidium has fewer protons and fewer electrons than calcium.
The correct statement comparing the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca) is:
Rubidium has more protons and more electrons than calcium.
Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point)
To find the number of neutrons in an atom, you subtract the atomic number from the atomic mass.
In the case of potassium (K), the atomic number is 19 and the atomic mass is approximately 39.
Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 39 - 19
Number of neutrons = 20
Therefore, potassium has 20 neutrons.
Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)
Responses
helium (He)
helium (He)
bromine (Br)
bromine (Br)
boron (B)
boron (B)
hydrogen (H)