Sistem Periodik Practice Questions
UN (Indonesia) · UN Kimia · 134 free MCQs with instant results and detailed explanations.
134
Total
36
Easy
70
Medium
28
Hard
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Sample Questions from Sistem Periodik
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Q1
Easy
Which of the following elements is classified as a noble gas?
A.
Helium
B.
Oxygen
C.
Nitrogen
D.
Carbon
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Correct Answer: A
Helium is classified as a noble gas because it is located in Group 18 of the periodic table, which contains elements that are inert and do not readily react with other substances.
Q2
Easy
What is the atomic number of Sodium (Na)?
A.
11
B.
12
C.
10
D.
9
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Correct Answer: A
The atomic number of Sodium is 11, which indicates that it has 11 protons in its nucleus. This information can be found in the periodic table.
Q3
Easy
Which of the following elements is a noble gas?
A.
Neon
B.
Oxygen
C.
Nitrogen
D.
Carbon
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Correct Answer: A
Neon is a noble gas, which means it is chemically inert and does not readily react with other elements, unlike the other options.
Q4
Medium
Which of the following elements has the highest electronegativity according to the periodic table?
A.
Fluorine
B.
Oxygen
C.
Chlorine
D.
Nitrogen
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Correct Answer: A
Fluorine is the most electronegative element on the periodic table, with an electronegativity value of 4.0, indicating its strong ability to attract electrons.
Q5
Medium
What is the expected number of valence electrons for an element in Group 2 of the periodic table?
A.
2
B.
4
C.
8
D.
6
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Correct Answer: A
Elements in Group 2 of the periodic table, also known as alkaline earth metals, have 2 valence electrons in their outermost shell, which is characteristic of this group.
Q6
Medium
Which of the following elements would you expect to have the largest atomic radius?
A.
Sodium (Na)
B.
Magnesium (Mg)
C.
Potassium (K)
D.
Calcium (Ca)
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Correct Answer: C
Potassium (K) is located lower in the periodic table compared to Sodium (Na), Magnesium (Mg), and Calcium (Ca), leading to a larger atomic radius due to the addition of electron shells.
Q7
Medium
If element X has the atomic number 15, which of the following statements is true regarding its position in the periodic table?
A.
It is a noble gas.
B.
It is a metalloid.
C.
It is a non-metal.
D.
It is an alkali metal.
Show Answer & Explanation
Correct Answer: C
Element X with atomic number 15 is phosphorus, which is classified as a non-metal, located in Group 15 of the periodic table.
Q8
Hard
In the periodic table, which element is most likely to have similar chemical properties to Sodium (Na)?
A.
Lithium (Li)
B.
Magnesium (Mg)
C.
Potassium (K)
D.
Calcium (Ca)
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Correct Answer: C
Potassium (K) is in the same group (Group 1) as Sodium (Na) in the periodic table, and elements in the same group have similar chemical properties due to having the same number of valence electrons.
Q9
Hard
Which group of the periodic table contains elements that readily lose electrons and form positive ions?
A.
Noble gases
B.
Alkaline earth metals
C.
Halogens
D.
Alkali metals
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Correct Answer: D
Alkali metals, located in Group 1 of the periodic table, readily lose one electron to form cations with a charge of +1. This characteristic makes them highly reactive, especially with water.
Q10
Hard
If an element has an atomic number of 26, which of the following statements is true regarding its position in the periodic table?
A.
It is a noble gas and forms anions.
B.
It belongs to the transition metals.
C.
It is a halogen with a full outer shell.
D.
It is an alkaline earth metal with two valence electrons.
Show Answer & Explanation
Correct Answer: B
An element with an atomic number of 26 is iron (Fe), which is classified as a transition metal. Transition metals are characterized by their ability to form variable oxidation states and complex ions.
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Sistem Periodik — UN (Indonesia) UN Kimia Practice Questions Online
This page contains 134 practice MCQs for the chapter Sistem Periodik in UN (Indonesia) UN Kimia. The questions are organized by difficulty — 36 easy, 70 medium, 28 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.