True or false. elements in the same period have the same number of valence electrons

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.