What were the four elements that ancient Greeks believed to exist

What two elements are involved in the nuclear fusion reaction?

Which of these is a typical property of a substance that is composed of atoms that are held together by covalent bonds? a. It conducts electricity when in solid form. b. It conducts electricity when in molten form. c.

Aluminium and phosphorus are close to one another in the Periodic Table but the P3 - ion is much larger than the Al3 + ion. Explain the reason for this change in size.

What fundamental characteristic do all atoms of the same element have in common? a. Number of neutrons b. Number of electrons c. Mass number d. Number of isotopes e. Atomic number

The atomic number of an element is the total number of which particles in the nucleus? a. neutronsc. electronsb. protons

The Carbon family element in period 4

Generally speaking, which group would have the lowest electronegativity values in a period? Group 1 Group 3 Group 14 Group 17

Radioactive decay is a spontaneous process. occurs when an unstable nucleus loses energy. does not require any input of energy. all of the above

What effect does a hypotonic solution have on a red blood cell?

A negative △H means an exothermic reaction. True False