How many protons and neutrons are in one atom of Si - 30

Which of the following showed electrons in specific, fixed orbits?

The alpha particles in Rutherford's experiments were used to -

Which of the following statements is most accurate regarding atoms?

Which of these elements is the most electronegative?

Which element has the largest atomic radius?

Which of the following elements has the largest atomic radius?

Which of the following atoms has the largest radius?

Which of the statements accurately describes the trends of electronegativity in the periodic table?

Which of these statements accurately describes the trend of ionic energies or atomic radii in the periodic table?

Which of these elements is the most reactive?

Neon is a noble gas. Which of the following describes neon?

Which of the following atoms would it be the most difficult to remove an electron?

Using the periodic table predict which elements will have similar chemical properties or reactivity.

Which family correctly represents the elements in Group on the periodic table?

As the atomic number on the periodic table increases the number of the electrons

Which of the following describes the properties of Noble Gases?

Mendeleev organized his periodic table in order of increasing atomic-

Mosely's research suggested that elements should be sorted by increasing atomic-