1. An atom has an atomic number of 12 and a mass number of 25. The number of electrons in the atom is
atomic structure

Quiz
•
Chemistry
•
9th Grade
•
Hard
Yiki Ng
Used 3+ times
FREE Resource
12 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
12
13
25
37
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
2. The relative atomic mass of an element is
The absolute mass of an atom of the element.
The total mass of protons and neutrons in its nucleus.
The average mass of an atom of the element as it occurs in nature, relative to the 12C = 12.000 00 scale.
The average mass number of different isotopes of the element relative to the 12C = 12.000 00 scale.
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
3. Which of the following statements can explain why noble gases are stable?
They are all gases at room temperature.
They are Group 0 elements.
They have eight electrons in their outermost shells.
They are all elements.
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
4. Which of the following elements is a metal?
Aluminium
Carbon
Germanium
Neon
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
5. Which of the following elements does NOT conduct electricity?
Bromine
Graphite
Magnesium
Gold
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
6. Which of the following elements is a solid at room temperature and pressure?
Cl
N
Ne
S
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
7. An atom has 28 electrons and 30 neutrons. Which of the following combinations about the atom is correct?
Atomic no.: 28 Mass no.: 30
Atomic no.: 28 Mass no.: 58
Atomic no.: 30 Mass no.: 28
Atomic no.: 58 Mass no.: 28
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