Question

unit 1 a: matter: the atom
homework

1. matter is defined as:

1. who 1st conceived the idea that matter maybe made of atoms?

1. what 2 properties describes matter: a)

____________ b) ______

1. matter is grouped into 3 categories, namely:

i.
ii.
iii.

1. as noted above. an atom is the fundamental unit of matter. name the components of an atom.

i.
ii.
iii.

1. label the regions on the structure of this atom

the atom

1. what part of the atom is most dense?

Explanation:

1. Matter is anything that has mass and takes up space (volume).
2. The ancient Greek philosopher Democritus first proposed the idea that matter is made of atoms.
3. Matter is described by mass and volume. Mass is the amount of matter in an object, and volume is the amount of space it occupies.
4. Matter is grouped into solids, liquids, and gases. Solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases have no definite shape or volume.
5. The components of an atom are protons (positively - charged), neutrons (neutrally - charged), and electrons (negatively - charged).
6. Without seeing the specific atom structure image, in general, the central part is the nucleus (containing protons and neutrons) and the outer - regions are electron shells where electrons are located.
7. The nucleus of the atom is the most dense part as it contains protons and neutrons which have much more mass than electrons and are packed closely together.

Answer:

1. Anything that has mass and takes up space.
2. Democritus.
3. a) Mass b) Volume
4. i. Solids ii. Liquids iii. Gases
5. i. Protons ii. Neutrons iii. Electrons
6. (Answer depends on the image, but generally) Nucleus; Electron shells
7. The nucleus.