If 3rd question is
Which of the following defines the atomic number of an atom?
Answer: the number of protons
Here are the answers for this quick check :>
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Q1) Which property do the elements in each column of the representative elements series of the periodic table have in common?
A1) number of valence electrons
Q2) Use the periodic table to answer the question.
Which element has six valence electrons?
A2) oxygen (O)
Q3) Use the periodic table to answer the question.
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
A3) Rubidium has more protons and more electrons than calcium.
Q4) Potassium's atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?
A4) 20
Q5) Which element does not have the same number of electrons in its outermost shell as the other elements in its group?
A5) helium (He)
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