Multiple Choice
In the periodic table, what are the horizontal rows called?
3
views
4. Atoms and Elements
Periodic Table: Classifications
Struggling with Introduction to Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the periodic table, what is the last element (highest atomic number) in Period 4?
A
Calcium (Ca)
B
Xenon (Xe)
C
Bromine (Br)
D
Krypton (Kr)
Verified step by step guidance1
Understand that the periodic table is arranged in periods (rows) and groups (columns), where each period corresponds to the filling of a specific electron shell.
Identify Period 4 as the fourth row in the periodic table, which includes elements starting from Potassium (K) with atomic number 19 to Krypton (Kr) with atomic number 36.
Recall that the atomic number increases by one as you move from left to right across a period, representing the number of protons in the nucleus of each element.
Recognize that the last element in a period is the one with the highest atomic number in that row, which completes the electron shell for that period.
Therefore, to find the last element in Period 4, look for the element with the highest atomic number in that row, which is Krypton (Kr) with atomic number 36.
2:40mWatch next
Master Periodic Table: Classifications with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Periodic Table: Classifications practice set
Problem sets built by lead tutorsExpert video explanations