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WorksheetsIS_Section Quiz_13.1_e
Total questions: 15
Worksheet time: 8mins
All elements occur naturally on Earth.
True
False
The chemical formula of a phosphorus molecule is P2.
True
False
Semi-metals can conduct electricity when they are mixed with a small amount of impurities.
True
False
The nucleus contains tightly packed protons and neutrons.
True
False
All elements are made up of molecules.
True
False
The chemical symbol of gold is Au.
True
False
The melting point of sodium is below 100 °C.
True
False
(E) The number of neutrons in an atom is different from that in the ion formed by that atom.
True
False
What is molecule M?
A. Gold
B. Hydrogen
C. Iron
D. Sulphur
The table shows the atomic number and the mass number of element X.
How many protons and electrons does the atom of element X have?
A. Number of protons: 19; Number of electrons:19
B. Number of protons: 19; Number of electrons:20
C. Number of protons: 20; Number of electrons:39
D. Number of protons: 39; Number of electrons:19
The table shows the atomic number and the mass number of element X.
How many neutrons does the atom of element X have?
A. 19
B. 20
C. 38
D. 39
(E) Which of the following statements about the ion formed is/are correct?
(1) It has the overall charge of +1.
(2) It has the same number of electrons as the atom.
(3) It has the same number of protons as the atom.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Which of the following elements CANNOT be represented by the model?
A. Chlorine
B. Hydrogen
C. Nitrogen
D. Phosphorus
Which of the following statements about boron and silicon is/are correct?
(1) They are semi-metals.
(2) They can conduct electricity under normal conditions.
(3) They are solids at room temperature.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
(E) Which of the following elements tend(s) to form a negatively charged ion?
(1) Iron
(2) Oxygen
(3) Potassium
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
