Science-Chemistry Test #1
Give the freezing point for the halogen in period 2.
-363.3 degrees F or (-219.6 degrees C)
Observe the model below to answer the following questions. (look at the test for the drawing)
...
Circle fluorine's (F) most likely ion.
1-
Suppose an atom has a full 1st shell and a full 2nd shell, but no electrons in the third shell. How many total electrons does this atom have?
10
If a new element were created that fit right under Radium (Ra) on the periodic table: How many protons would it have?
120
the isotope of uranium used in nuclear reactors, uranium-235, contains 92 protons. Another isotope, uranium-238, contains _________neutrons
146
Use the periodic table to draw an atom of Phosphurus (P)
15 protons and 31 neutrons
If a new element were created that fit right under Radium (Ra) on the periodic table: How many valence electrons would it have?
2
What is the charge of the atom in question #24
2-
What is the melting point of bromine (Br)?
265.8K (-7.2 degrees C, 19 degrees F)
How many energy levels are occupied by electrons in the atom mentioned in question #24
3
How many energy levels are occupied in an atom of the element family 1, period 3?
3
Circle boron's (B) most likely ion
3+
In nature, bromine (Br) tends to gain an electron when it reacts with other elements. After doing so, the bromide will have a charge of 1- and a total of____ electrons
36
An atom has 22 protons, 22 electrons and 24 neutrons. Its atomic mass is
46
How many neutrons does a typical silver (Ag) atom have?
61
The number of protons in an atom is referred to as the ____
Atomic number
This model was the first to describe the specific location of electrons
Bohr
His pioneering model had indivisible atoms that were basically just a solid ball. (No one's perfect)
Dalton
What units do we use to label the mass of an atom?
Daltons
What element is this?
Fluorine
Why is H considered to be "misplaced" on the periodic table despite its number of valence electrons?
Hydrogen can behave like an alkali metal and lose an electron or behave like a halogen and gain an electron.
Electron Cloud
In this model, electron orbits described in previous models are refuted and are changed to indicate that the electrons locations are undetermined, but the likelihood of location may be determined.
Which family contains elements that are highly unreactive?
Noble gases
Which statement about subatomic particles is NOT True?
Protons and neutrons have the same charge.
The model first to conclude that atoms are mostly empty space
Rutherford
What element often exists as a 2- ion & has a density of 4.79 g/cm³
Se (selenium)
Which element's neutral (uncharged) atom has 14 protons?
Silicon
Which element is true about the picture
The atom is electrically neutral
Which statement is true about O-17band O-18?
They are isotopes of oxygen
Gold atoms can sometimes have a 3+ charge. How did they get this charge?
They lost electrons
This model includes a positively charged mass with negatively charged embedded throughout it
Thomson
Element has an atomic mass of 51 and its most isotope has 28 neutrons
Vanadium
An element
a single element
Metals that are never found free in nature but are always found combined in a compound are in the ______family.
alkali
Which family loses electrons most easily?
alkali metals
Which of these families contain elements which are the most reactive nonmetals
alkali metals
When element "x" is a 2-ion, it has 18 electrons. This element is:
argon
Name the element that has 5 valence electrons, shows properties of both metals and non-metals and has more than 60 neutrons.
arsenic
The smallest part of an element is an______
atom
The original periodic table arranged the known elements in a table according to increasing
atomic mass
You have discovered a new element and trying to decide where to place it on the periodic table. List two of pieces of information you need to accurately place the element?
atomic number (# of protons) and valance electrons
Which family always contains elements with only four valence electrons?
carbon group
Which particle determines an atom's reactivity
electrons
Which of the elements is most reactive
element 26
Elements in the vertical column______
have similar but not identical properties
When an atom has unequal numbers of protons and electrons, it is an
ion
Atoms that have a charge are called
ions
When electrons move from a higher energy to a lower energy level, they release energy in the form of:
light
When forming compounds, most nonmetals tend to:
lose electrons
If a new element were created that fit right under Radium (Ra) on the periodic table: Would it be a metal or nonmetal?
metal
Which general statement does not apply to metals?
most metals are brittle
What is the atomic number of the atom described in question #24
none of the one listed
Most of an atom's volume is in the ______
nucleus
On a modern periodic table, elements are arranged in order of increasing atomic______
number
Which can never change for atoms of a given element?
number of protons
Atoms of the most reactive elements tend to have ________
one or seven valence electrons
Give the family name AND period for Aluminum (Al)
other metals (Group 13), period 3
Which family of elements will most likely lose 2 electrons in order to be stable
oxygen
In an electrically balanced (uncharged) atom, which subatomic particles are always present in equal numbers?
protons and electrons
Name the element in the oxygen family, period 3.
sulfur
The usefulness/accuracy of the original periodic table was confirmed by
the discovery of elements with the predicted properties
Why are the atomic masses on the periodic table given decimal values (ex:Oxygen's mass is 15.9994)?
there are isotopes of oxygen that are being factored in.
The element in family 4, period 4 is:
ti (titanium)
which list of elements contain only metals
tin, copper, cesium
Even though an electron is much, much less massive than a proton, its charge is large enough to cancel out the charge of a proton
true
The _________electrons are those found in the outermost energy level of the atom
valence
