First 36 Elements Quiz
Questions: 16 · 10 minutes
1. Which element has atomic number 29?
Nickel
Zinc
Copper
Cobalt
2. Which of the first 36 elements has atomic number 17?
Magnesium
Potassium
Chlorine
Argon
3. Why do magnesium and calcium often show similar chemical behavior?
They are both noble gases with filled outer shells.
They are in the same period and have equal numbers of electron shells.
They have the same atomic number but different mass numbers.
They are in the same group and each has two valence electrons.
4. Which element completes period 4 among the first 36 elements?
Bromine
Selenium
Krypton
Zinc
5. An element is described as the noble gas in period 3. Which element matches both clues?
Argon
Chlorine
Krypton
Neon
6. At typical room conditions, which of these first 36 elements is a liquid?
Bromine
Gallium
Krypton
Chlorine
7. A magnesium atom loses its two valence electrons. Which ion does it form?
A magnesium ion with a positive two charge
A magnesium ion with a negative one charge
A magnesium ion with a positive one charge
A magnesium ion with a negative two charge
8. A neutral atom has electrons arranged 2, 8, 7 across its occupied shells. Which element is it?
Sulfur
Chlorine
Argon
Fluorine
9. A lab sample is identified as a period 4 alkali metal. Which of the first 36 elements must it be?
Calcium
Potassium
Scandium
Rubidium
10. Sodium and magnesium are next to each other in period 3. Which prediction about their atomic size is correct?
Their atomic sizes cannot be compared from periodic-table position.
Magnesium has the larger atomic radius because it has more protons.
They have the same atomic radius because they are in the same period.
Sodium has the larger atomic radius because atomic radius generally decreases across a period from left to right.
11. Which element name and symbol are correctly paired?
Cr — Copper
Ca — Cadmium
Cl — Cobalt
Co — Cobalt
12. What is the chemical symbol for potassium?
P
Po
Pt
K
13. A neutral atom contains 34 electrons. Which element is it?
Arsenic
Selenium
Bromine
Germanium
14. Chlorine-35 and chlorine-37 are isotopes. What distinguishes them?
They have the same number of protons but different numbers of neutrons.
They have different numbers of protons but the same number of neutrons.
They have different chemical symbols and occupy different groups.
They have the same mass number but different electrical charges.
15. A student needs a metalloid among the first 36 elements that is widely used as a semiconductor. Which element fits?
Selenium
Gallium
Germanium
Zinc
16. A student wants an element among the first 36 that is in the same periodic-table group as oxygen. Which should they choose?
Phosphorus
Sulfur
Chlorine
Argon