Monday
September 22, 2014

Homework Help: science

Posted by Connexus on Thursday, April 3, 2014 at 11:28am.

1.  
Which is most likely to be part of an ionic bond?  (1 point)
an atom with no valence electrons
an atom with one valence electron
an atom with two valence electrons
an atom with three valence electrons
2.  
To form an oxygen molecule (O2), two oxygen atoms share two pairs of electrons. What kind of bond is shown below by the electron dot diagram of O2? Choose all that apply.
 (2 points)
covalent bond
ionic bond
single bond
double bond
triple bond
Use your reference copy of the periodic table to answer question 3.
3.  
What is true about the element francium (Fr, atomic number 87)? Choose all that apply.  (3 points)
It has seven valence electrons.
It is likely to form ionic bonds.
It is a nonmetal.
It is in Period 7.
It is a metal.
4.  
Ernest Rutherford’s atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick’s discovery change the atomic model?  (1 point)
The new model showed a negatively charged nucleus.
The new model showed a neutrally charged nucleus.
The new model showed a larger electron cloud.
The new model showed a nucleus with two types of particles.
5.  
What conclusions about atoms can you draw from the modern atomic model shown below? Choose all that apply.

 (3 points)
Atoms are made of two distinct particles.
Electrons occupy a single energy level.
Electrons are smaller than protons.
The majority of an atom's mass is in the nucleus.
Protons and neutrons are about the same size.
6.  
Which physical properties are characteristic of nonmetal solids? Choose all that apply.  (2 points)
brittle
little luster
malleable
ductile
good conductors of heat
7.  
The atom shown below is

 (1 point)
likely to form a covalent bond
likely to form an ionic bond
not likely to form any bonds
likely to form double bonds
8.  
A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely  (1 point)
from Group 17.
from Group 1.
from Group 15.
a noble gas.
9.  
A row of elements on the periodic table is called a(n)  (1 point)
group.
period.
valence.
orbital.
Use the diagram to answer question 10.

Image courtesy of Discovery Education™ streaming
10.  
Metal cations are atoms that have a positive charge. What type of bond is a metal cation likely to form?  (1 point)
covalent bond
double bond
single bond
ionic bond

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