Which properties are characteristic of metalloids?

intermediate conductivity and a high melting point

What are the two parts of an atom?

the nucleus and the electron cloud

Atom A and Atom B have the same number of protons but they do not have the same number of neutrons. Describe.

Atom A and Atom B are isotopes of the same element.

Which argument best explains the charge of an atomic nucleus?

An atomic nucleus is positively charged because it is composed of protons.

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Atoms and The Periodic Table

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1
Which properties are characteristic of metalloids?
low electrical conductivity and a low melting point
intermediate conductivity and a low melting point
intermediate conductivity and a high melting point
high electrical conductivity and a high melting point
2
Who is the "father of modern chemistry” because he first organized all known elements into four different groups?
Henry Moseley
Antoine Lavoisier
Johann Wolfgang Döbereiner
Dmitri Mendeleev
3
In what order should you put these models to show the development from the earliest to the most recent model of an atom?
W, Y, Z, X
Y, X, Z, W
Y, Z, W, X
W, Z, X, Y
4
What are the two parts of an atom?
the neutron and the electron cloud
the neutron and the proton cloud
the nucleus and the electron cloud
the nucleus and the proton cloud
5
Which best describes a radioactive isotope?
There are many isotopes.
An atom is stable.
An atom is unstable.
There is only one other isotope.
6
Who described atoms as small spheres that could not be divided into anything smaller?
Rutherford
Dalton
Thomson
Bohr
7
What did Rutherford’s model of the atom include that Thomson’s model did not have?
smaller particles
energy levels
a nucleus
electron clouds
8
The arrow is pointing to sodium’s
combined number of electrons and protons.
atomic mass
chemical symbol
Number of neutrons
9
Which property do metalloids share with nonmetals?
Both are very conductive.
Both are brittle.
Both have low melting points.
Both are shiny.
10
Atom A and Atom B have the same number of protons but they do not have the same number of neutrons. Describe.
Atom A and Atom B have different atomic numbers.
Atom A and Atom B are isotopes of the same element.
Atom A and Atom B have the same mass number.
Atom A and Atom B are different elements.
11
When an atom that has no charge loses two electrons, it becomes a
positive isotope.
positive ion.
negative isotope.
negative ion.
12
An atom of the element zinc has an atomic number of 30 & mass number of 65. How many protons does a zinc atom have?
95
30
35
65
13
Which argument best explains the charge of an atomic nucleus?
An atomic nucleus is positively charged because it is composed of protons.
Atomic nucleus is negatively charged because it is composed of electrons.
An atomic nucleus is negatively charged because it is composed of neutrons.
An atomic nucleus is positively charged because it is composed of neutrons.
14
Which property of the isotopes must be different?
the element name
the electric charge
the mass number
the atomic number
15
Which statement describes a property of a proton?
is found outside the nucleus
has a positive charge
is repelled by electrons
has less mass than an electron

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