Grade 10 · Chemistry
Protons, electrons, groups, and periods. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: +1
Electrons are −1; neutrons are 0.
Answer: number of protons, different neutrons
Carbon-12 and carbon-14 are isotopes.
Answer: similar chemical properties
Noble gases are Group 18.
Answer: row
Period 2 has Li through Ne.
Answer: has gained or lost electrons
Na⁺ lost one electron.
Answer: shares electrons
H₂O has covalent bonds.
Answer: a metal and a nonmetal
NaCl is ionic.
Answer: in the outermost shell and drive bonding
The group number often hints at valence count for main groups.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
