Is Nitrogen reactive and what will happen to its valence electrons if it does react?

reactive; it will gain 3 valence electrons

The main difference between the modern periodic table and the original periodic table is:

The modern table arranges elements by increasing atomic #

Which statement best explains why most atomic masses on the Periodic Table are decimals?

It's a weighted average of mass #'s of an element’s isotopes

weighted average of mass #'s of all isotopes of an element

The chemical properties of atom are determined by the number of what?

the number of electrons in the atom's outer shell

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Atoms/Periodic Table

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Questions 23

Answers

1
What do nuclei of atoms contain?
protons and neutrons
electrons and neutrons
protons and electrons
electrons
2
Is Nitrogen reactive and what will happen to its valence electrons if it does react?
reactive; its 5 valence electrons will be lost
reactive; it will gain 3 valence electrons
reactive; it will gain 5 valence electrons
not reactive
3
Why does each isotopes have its own mass number?
none of the above
it has its own # of electrons
it has its own # of protons
it has its own # of neutrons
4
The main difference between the modern periodic table and the original periodic table is:
The modern table arranges elements by increasing atomic #
Original table was not able to predict new elements
They are the same except we know about more elements now.
Original one arranged elements according to atomic #
5
Is Radon (Rn) reactive and what will happen to its valence electrons if it does react?
reactive; it will gain 8 valence electrons
reactive; it will lose 4 valence electrons
not reactive
reactive; it will lose 8 valence electrons
6
Which statement best explains why most atomic masses on the Periodic Table are decimals?
Isotopes contain the same number of protons and neutrons
Mass numbers are usually not accurate and must be rounded
It's a weighted average of mass #'s of an element’s isotopes
None of the above
7
This element has 10 protons, 8 neutrons, and 10 electrons. What is its mass number?
18
10
2
none of the above
8
What is atomic mass?
the number of protons
weighted average of mass #'s of all isotopes of an element
the number of neutrons and protons
weighted average of atomic #'s of all isotopes of an element
9
Energy levels in the electron cloud are fill from ___________ to _____________.
depends on the atom
lowest to highest
there is no specific order that the energy levels are filled
highest to lowest
10
If an atom has 12 electrons, then how many protons does it have?
8
12
10
11
11
The current periodic table is organized by what?
increasing mass number
increasing atomic mass
increasing atomic number
decreasing atomic number
12
The nonmetals are located _________ the periodic table.
left side of
right side of
along the stair step line dividing left &right side elements
13
The columns of the periodic table are called
Groups
Periods
Orders
Classes
14
1.) What is mass number?
number of protons and neutrons
number of protons
number of protons and electrons
number of neutrons
15
An isotope has a mass number of 14. It has 7 neutrons. How many electrons does it have?
14
7
none of the above
21
16
What surrounds the nucleus of an atom?
protons and electrons
protons and neutrons
electrons
electrons and neutrons
17
Russian chemist, Mendeleev, came up with the first periodic table that was organized by what?
decreasing atomic number
increasing mass number
increasing atomic number
increasing atomic mass
18
1.) What is atomic number?
number of protons plus electrons
number of neutrons
number of protons
number of protons plus neutrons
19
Which of the following would not be found on a typical square on the periodic table?
chemical symbol
mass number
atomic number
atomic mass
20
The rows of the periodic table are called
Periods
Groups
Orders
Classes
21
Is magnesium a metal, a nonmetal, or a metalloid?
metal
not enough information to tell
nonmetal
metalloid
22
The chemical properties of atom are determined by the number of what?
the number of neutrons
the number of electrons in the atom's outer shell
the number of protons
the number of protons plus the number of neutrons
23
Elements of the same group on the periodic table, they have the same number of what?
number of neutrons
number of protons
number of electrons in general
number of valence electrons

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