Science homework week 2 term 3
1. a) Electrons
B) protons and neutrons
C) Proton D)
Electrons E) Neutrons
F) Electrons
G)Neutrons and
protons.
2.The neutrons and protons make up the nucleus and the electrons
surround in the shells of the atom.
3. Protons and electrons have the same number as the atomic
number of that atom.
4. A) Represents the amount of protons and electrons in that
element. B) The mass number minus the atomic number equals
the number of neutrons.
C) Electrons spin around the nucleus in
empty space.
5. Fe- 26 electrons and protons, 30 neutrons. Ni- 28 electrons and
protons, 31 neutrons. Cu- 29 protons and electrons, 35 neutrons. Au79 protons and electrons,118 neutrons.
• 8. All matter was composed of tiny particles called atoms.
Atoms could not be broken into smaller particles.
• Atoms of the same element are alike.
• Atoms join together in different ratios.
B) Later it was found that atoms down into protons neutrons and
electrons.
9. atoms do not usually exist by themselves they usually exist in a
group called a molecule.
19. A) 1 sulfur and 2 Oxygen’s
B) 2 hydrogen’s and 1 sulfur C)
12 carbon’s, 22 hydrogens and 11 Oxygens
D) 2 hydrogens, 1
sulfur and 4 Oxygen’s E) 1 Carbon, 3 hydrogens,1 carbon, 2 seprate
oxygen’s, and another separate hydrogen.
20.
Atom
Atomic Mass
Number Number Number Symbol
of
of
for the
number number of
protons neutrons electrons atom
Carbon
6
12
6
6
6
12/6 C
Sulfur
Sodium
16
11
Oxygen 8
Fluorine 9
Iodine
53
32
23
16
11
16
12
16
11
16
19
127
8
9
53
8
10
74
8
9
53
32/16S
23/11
Na
16/8 O
16/9 F
74/53 I