Elemental Quest I

What is the chemical symbol for Zinc?

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Identify the element that has an atomic number of 28

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Identify the element that has an atomic number of 10

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What is the atomic number of this element?

• 17

• 27

• 29

• 20

Answer explanation

The atomic number represents the number of protons in an element. The correct answer is 27, which corresponds to the element cobalt (Co) on the periodic table.

What is the chemical name of this element?

• Copper

• Carbon

• Copernicium

• Chromium

Answer explanation

The correct answer is Chromium, which is a chemical element with the symbol Cr and atomic number 24. It is distinct from Copper (Cu), Carbon (C), and Copernicium (Cn), making Chromium the accurate choice.

Determine the number of electron in a Chlorine atom given its atomic mass and number of neutron.

• 18

• 17

• 35

• 53

Answer explanation

A Chlorine atom has an atomic number of 17, which indicates it has 17 protons. Since atoms are neutral, the number of electrons equals the number of protons. Therefore, a Chlorine atom has 17 electrons.

What is the atomic number of Na and Fe?

• 11 and 25

• 12 and 24

• 13 and 27

• 11 and 26

Answer explanation

The atomic number of Sodium (Na) is 11, and for Iron (Fe) it is 26. Therefore, the correct answer is 11 and 26.

Which of the following set of elements has odd atomic number?

• C and Al

• Cr and B

• H and Zn

• K and Co

Answer explanation

K (Potassium, atomic number 19) and Co (Cobalt, atomic number 27) both have odd atomic numbers. The other pairs contain at least one element with an even atomic number.

The element which has two atomic number greater than Si but seven atomic number less than V is -------

• P

• Cl

• Ar

• S

Answer explanation

Silicon (Si) has an atomic number of 14. Two atomic numbers greater is 16, and seven less than Vanadium (V, atomic number 23) is also 16. The element with atomic number 16 is Sulfur (S). Thus, the answer is S.

The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers

Answer explanation

The horizontal rows in the Periodic Table are called periods. Each period represents a different energy level of electrons in the elements, distinguishing them from groups or families, which are vertical columns.