1. An electron has a __________
charge.
Negative
2. Protons have a __________ charge.
positive
3. Neutrons have a _________ charge.
neutral
4. Where is most of the mass
found in an atom?
nucleus
5. What subatomic particles are found in the
nucleus of an atom?
Protons & neutrons
6. Where are electrons likely to be found in an
atom?
Electron cloud
7. Most of atom is __________ space where
electrons are found.
empty
8. The periodic table organized elements by
Atomic number
9. The atomic number is the number of
protons
10. Elements in which group are poor
conductors of heat and electricity?
nonmetals
11. What are isotopes?
Atoms of the same
element that have
different numbers of
neutrons.
12. What is mass number?
The sum of the number
of protons and neutrons
in an atom.
13. What is an element?
Pure substance that
cannot be broken down
into any simpler
substances.
14. The periodic table is mostly made of
_________.
metals
15. How do you get the mass number?
Round the average
atomic mass to the
nearest whole number.
16. What determines an element’s identity?
protons
17. Which part of the atom is shared, gained,
or lost when forming a chemical bond?
electrons
18. What is the atomic number of potassium?
19
19. What is the atomic mass of Calcium?
40.08
20. What is the mass number of iron?
56
21. How many protons does Silicon have?
14
22. How many neutrons does Argon have?
22
23. How many electrons does Phosphorus have?
15
24. A small particle that makes up matter is
called ___________.
an atom
25. What are valence electrons?
Electrons in the
outermost energy level