What do you think the elements that are in the same group or period on the periodic table have in common?

How are isotopes of the same chemical element alike? how are they different?

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?