Unit 1 Theories

Question 1

Daltons Atomic Theory

Answer 1

1. Each element is composed of indestructible atoms
2. All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements
3. Atoms combine in simple, whole-number ratios to form compounds

Question 2

Nuclear Theory of an Atom

Answer 2

1. Most of the atoms mass and all of its positive charge are combined in a small core called the nucleus
2. Most of the volume of the atom is empty space through which tiny, negatively charged electrons are dispersed
3. There are as many negatively charged electrons outside the nucleus as there are positively charged particles (proton) inside the nucleus, so that the atom is electrically neutral

Question 3

3 main properitoes of electrons

Answer 3

they carry a negative
they are smaller and lighter than protons and neutrons
they are uniformly present in many different substances