MYP Science: The Periodic Table (Intro) FAQ

The periodic table is a chart arranging every known chemical element by increasing atomic number, grouped by shared chemical properties. In MYP Science you use it to find an element's group, period, atomic number, and whether it behaves as a metal, non-metal, or metalloid.

Elements sit left to right by increasing atomic number, which equals the number of protons in the nucleus. Rows, called periods, show how many electron shells an atom has. Columns, called groups, contain elements sharing the same number of valence electrons.

A group is a vertical column — elements in it share the same number of valence electrons and similar chemical behaviour. A period is a horizontal row, showing how many electron shells an atom has. Group 1 (alkali metals) and Group 18 (noble gases) come up most in MYP assessments.

Metals sit on the left and centre of the table, are shiny, malleable, and conduct heat and electricity well. Non-metals sit on the right, are dull, brittle as solids, and conduct poorly. Metalloids like silicon sit along the zig-zag line and show mixed properties.

Periodic trends are predictable patterns in properties as you move across a period or down a group — reactivity, atomic radius, and metallic character are the ones examiners ask about most. Reactivity increases down Group 1 but decreases across Period 3 as elements become less metallic.

Elements in the same group have the same number of valence (outer-shell) electrons, and it's those outer electrons that control bonding and reactivity. Because the valence electron count repeats every time you move down a group, the chemical behaviour repeats too, even though the atoms get physically larger.

First, spot the command term — describe, explain, or predict. Then use the element's group and period to name the relevant trend, and link it to electron configuration. Examiners award marks for using precise terms like "valence electrons" and "atomic radius", not just vague description.

The atomic number — usually the smaller number above the symbol — gives you the number of protons (and electrons in a neutral atom). The mass number gives protons plus neutrons combined. Subtract the atomic number from the mass number to find the number of neutrons.

Common command terms include "state" (a short answer, no reasoning needed), "describe" (a detailed account of what you observe), "explain" (reasons using cause and effect), and "predict" (a likely outcome based on a pattern). Knowing the term tells you exactly how much reasoning to write.

The periodic table usually falls under MYP Sciences Criterion A: Knowing and Understanding, where you describe patterns, apply scientific knowledge, and analyse data using the table. Reaching the top achievement band (7-8) means explaining trends with scientific reasoning, not just recalling group numbers or element names.

Ask your child to explain a trend out loud — reactivity, atomic radius, or metallic character — using a periodic table in front of them. Teaching it back is the fastest way to catch gaps. Flashcards for the first 20 elements' symbols and group names build the recall speed MYP assessments reward.

Look for resources combining diagrams with genuine practice questions, since MYP assessment requires applying group and period patterns, not just naming them. On RevisionPrep, MYP Sciences Revision Notes and Topical Worksheets cover the periodic table with practice questions mapped to command terms and Criterion A skills.