BASIC CHEMISTRY for BIOLOGY CHEMICAL SYMBOLS OF ELEMENTS Element A substance tha
ID: 143173 • Letter: B
Question
BASIC CHEMISTRY for BIOLOGY CHEMICAL SYMBOLS OF ELEMENTS Element A substance that cannot be broken down into other substances by chemical reactions 1. Write the name of the element by each of the following symbols: Na Si Br Ca 2. What elements are present in each of the following? . KBr b. CCl c. NaOH d. MgClz e. NaNO ATOMIC STRUCTURE An atom is the smallest possible unit of matter that retains the physical and chemical properties of the element. 1. An atom consists of an inner part, or and , that is made up of 2. The electron has what type of charge? 3. The proton has what type ofcharge 4·The neutron has a charge of 5. Atoms are electrically neutral. This means that an atom will contain: a) more protons than electrons b) more electrons than protons can equal number of protons and electrons 6. The atom with the simplest atomic structure is hydrogen. atom consists of one The nucleus of the hydrogen The outer part of the atom, the electron cloud. contains oneExplanation / Answer
Chemical Symbols and Elements
1) Name of the elements
H - Hydrogen
N - Nitrogen
O - Oxygen
Ca - Calcium
Na - Sodium
K - Potassium
C - Carbon
S - Sulphur
Si - Silicon
Br - Bromine
Zn - Zinc
Fe - Iron
2) Elements present in the following molecules
a) KBr - Potassium and Bromine
b) CCl4 - Carbon and Chlorine
c) NaOH - Sodium, Oxygen and Hydrogen
d) MgCl2 - Magnesium and Chlorine
e) NaNO3 - Sodium, Nitrogen and Oxygen
f) K3FeC6N6 - Potassium, Iron, Carbon and Nitrogen
ATOMIC STRUCTURE
1) An atom consists of an inner part, or nucleus, that is made of protons and neutrons.
2) The electron has a negative charge.
3) The proton has a positive charge.
4) The neutron has a charge of zero.
5) An electrically neutral atom will have an equal number of protons and electrons.
6) The nucleus of the hydrogen atom consists of one proton and the outer part of the atom, the electron cloud consists of one electron.
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