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What determines the atomic number of an element?
The number of protons in the nucleus
Calculate the number of neutrons in an isotope of sodium(11) with a mass number of 23.
12 neutrons (23 - 11 protons)
How do you find the mass number of an atom?
By adding the number of protons and neutrons
What are isotopes?
Atoms of the same element with different numbers of neutrons.
Atoms of the same element having the same atomic number, but different mass numbers are called...
Isotopes
The symbol Co stands for the element...
Cobalt
An atom with 15 protons and 16 neutrons is an atom of...
Phosphorus
What two particles reside in the nucleus?
Proton and Neutron
Lithium has how many electrons in its outermost shell?
1
The symbol for the element Krypton is...
Kr
How many protons, electrons, and neutrons does Potassium have?
19, 19, 20
You are given the atomic number and the atomic mass of an atom. How do you find the number of neutrons?
Atomic Mass - Atomic Number
How many electrons does a neutral atom of Neon (atomic number 10) have?
Ten
How many neutrons are there in an atom of Xenon-134 (Atomic number 54)?
80
Beryllium has an atomic number of 4 and a mass of 9. How many of each particle does it have?
Protons: 4 Electrons: 4 Neutrons: 5
What does the atomic number tell you about a neutral atom?
How many protons and electrons there are.
Which particle has the smallest mass?
Electron
What charges do the following particles have, in order? Proton, Neutron, Electron
+, 0, -
What two particles make up most of the mass in an atom?
Protons and neutrons
Which particle resides in the outer nucleus
Electron