Subatomic particles
A subatomic particle with a mass equal to 1/1840 the mass of a proton.
An electron.
The mass number of an element is equal to......
The total number of protons and neutrons in the nucleus
Atoms of an element with different numbers of neutrons.
Isotopes
A positively charged particles that has lost electrons.
Cation
Differences in electronegativity can cause--------------
polarity
Subatomic particles that have almost equal masses.
A proton and A neutron.
The number of neutrons in Oxygen-16 is.........
8
The weighted average of the masses of the isotopes of the element is called...................
the atomic mass of an element
It increases from left to right and from bottom to top of the periodic table.
Electronegativity
This is the most electronegative element in the periodic table.
Fluorine
The central core and is composed of protons and neutrons.
The nucleus
One-twelfth the mass of one carbon-12 atom equals
one atomic mass unit
To calculate the atomic mass of an element, we need----
the masses and relative abundance of each isotope of the element
Are always written as numbers followed by a plus or minus sign.
Charges on ions
Polar and non-polar exist only in ......
covalent molecules
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are
76 protons and 76 electrons
The number 84 in the name krypton-84 represents------------------
the mass number
Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?
19.9 amu
Magnesium and oxygen combine to form
an ionic bond
The electronegativity difference in Cl2 is ----------
zero
All atoms of the same element have the same..........
Number of protons
Unit used to measure weighted average atomic mass is-----------------
amu
The element chromium has four naturally occurring isotopes. Use the relative abundance of each to calculate the average atomic mass of chromium.
50 Cr = 4.34%, 52 Cr = 83.79%, 53Cr = 9.50%, 54Cr = 2.37%.
52 amu
High melting point ,soluble in water ,and Poor conductor of electricity when solid are all properties of .............
ionic compounds
It involves the sharing of two pairs of electrons.
A double bond