The effective nuclear charge acting on an electron is larger than the actual nuclear charge. The effective nuclear charge acting on an electron is larger than the actual nuclear charge. True False

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

There are main groups in the modern periodic table of elements

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons