Building vocabulary
from the list below, choose the term that best completes each sentence.
atomic mass unit (amu) electron
family group
neutron
nucleus
period v periodic table
proton
10. a(n) valence
is involved in the transfer or sharing of electrons.
11. a(n) protons is a positively charged particle in the nucleus.
12. an element's period is its row in the periodic table.
13. the central core of an atom is called the nucleus
14. a(n)
carries a negative electrical charge, and is located
outside an atom's central core.
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15. mendeleev was the first to arrange elements according to their properties in
a(n)
16. elements in a(n)
_ог
of the periodic
table have similar characteristics.
17. a(n) nechtron is a particle in the nucleus that has no charge.
18. scientists use the atomic mass to measure the mass of the particles
within the atom. unit