Question 1

Which scientist is credited with organizing the elements by their chemical properties into the first version of the periodic table in 1869?

Accepted Answer

Dmitri Mendeleev

Question 2

What is the primary basis for the arrangement of elements in the modern periodic table?

Accepted Answer

Atomic number

Question 3

Which of the following elements is a halogen with the smallest atomic number?

Accepted Answer

Fluorine, F

Question 4

Given the periodic table, which pair of elements would you expect to be chemically similar based on their number of protons?

Accepted Answer

$$Z = 12$$ and $$Z = 20$$

Question 5

What does the element symbol 'Na' stand for?

Accepted Answer

Sodium

Question 6

Which of the following statements best describes the periodic law?

Accepted Answer

Elements are arranged by increasing atomic number, showing periodic repetition of properties.

Question 7

If an element has the symbol 'K', what is its name and which group does it belong to?

Accepted Answer

Potassium, alkali metals

Question 8

Which element is located in group 2A and period 3 of the periodic table?

Accepted Answer

Magnesium, Mg

Question 9

An element has 17 protons. What is its chemical symbol?

Accepted Answer

Cl

Question 10

Which of the following is NOT a property used to organize elements in the periodic table?

Accepted Answer

Color

Question 11

If two elements are in the same group, what can you infer about their chemical properties?

Accepted Answer

They have similar chemical properties.

Question 12

Which element is represented by the symbol 'Fe'?

Accepted Answer

Iron

Question 13

What is the atomic number of the element with the symbol 'O'?

Accepted Answer

$$Z = 8$$

Question 14

Which element is a noble gas with atomic number 10?

Accepted Answer

Neon, Ne

Question 15

If an element is in period 4 and group 1A, what is its symbol?

Accepted Answer

K

Question 16

Which of the following elements is an alkaline earth metal?

Accepted Answer

Magnesium, Mg

Question 17

What is the symbol for the element with atomic number 12?

Accepted Answer

Mg

Question 18

Which element is in the same group as sodium and is found in period 2?

Accepted Answer

Lithium, Li

Question 19

If an element has the symbol 'Ca', what is its atomic number?

Accepted Answer

$$Z = 20$$

Question 20

Which of the following elements is most likely to have chemical properties similar to magnesium?

Accepted Answer

Calcium, Ca

Introduction to the Periodic Table: Element Symbols and Atomic Number

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