Protons, neutrons and electrons
Grade 8 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Ari reads that an iron atom has mass number 56 and 30 neutrons. How many protons does it have?
Bo reads that a copper atom has mass number 63 and 34 neutrons. How many protons does it have?
Esme reads that a boron atom has mass number 11 and 6 neutrons. How many protons does it have?
Jun says electrons sit inside the nucleus, next to the protons. Agree or disagree?
- Disagree: electrons are outside the whole atom
- Agree: the nucleus holds the whole atom
- Agree: opposite charges sit together
- Disagree: electrons are around the nucleus
Kira says a neutron has a small positive charge. Agree or disagree?
- Agree: it is a weak proton
- Agree: it sits with the protons
- Disagree: it has no charge
- Disagree: it is negative
Read this first
Table (IUPAC data)
Atomic number, symbol, name. 5 B boron; 6 C carbon; 7 N nitrogen; 8 O oxygen.
A carbon atom has 6 protons and 6 neutrons. If it had one more neutron, what would it be, Milo?
- Boron, since it is heavier
- Oxygen
- Still carbon, with mass number 13
- Nitrogen, the next element
Imagine the same carbon atom with one more proton instead. Using the table, what would it be, Noah?
- Still carbon, since neutrons decide
- Nitrogen
- Boron
- Element 13, from the mass number
Ren checks three classmates' atom models. Which one is right?
- Protons and neutrons in the center, electrons around
- Particles spread evenly through the atom
- Electrons drawn inside the nucleus
- Neutrons marked −, electrons marked +
Tala labels an atom model's key. Which set of labels is right?
- Proton +, neutron no charge, electron −
- Proton +, neutron −, electron −
- Proton +, neutron +, electron −
- Proton −, neutron no charge, electron +
A model shows a tiny nucleus and a wide cloud of electrons. Where is most of the mass, Zee?
- Nowhere: atoms are empty
- In the wide electron cloud
- Shared evenly, since everything counts the same
- In the tiny nucleus