Periodic Table
The Periodic Table is organized by the number of ________
protons
The inner part of an atom that contains the proton and the neutron is called the __________.
Nucleus
The atomic mass is the sum of what two sub-atomic particles
Protons and Neutrons
This is anything that takes up space (has a mass).
matter
Atomic numbers of an atom are the same as the number of what in an atom?
protons
The modern periodic table is arranged by this number
atomic number
These particles have a positive charge and are found inside the nucleus.
proton
Atomic masses are not the same as mass numbers. You will find the atomic mass as a decimal on the
periodic table
The smallest pieces of matter are called __________.
atoms
Carbon's atomic number is _______.
6
This scientist arranged the periodic table by increasing atomic number
Mendeleev
These particles are located within the nucleus, and have no charge.
Neutron
A proton has the atomic mass of what?
1
What are the units used to measure Mass for all objects except atoms
Grams
What element has a number of 2?
helium
Elements that have similar chemical properties or reactivity are arranged in columns called this
Groups or Family
These particles are negatively charge and are found outside the nucleus.
electrons
A neutron has a similar weight as this positively charged subatomic particle
1
The amount of space matter takes up is called what?
volume
When atoms give up electrons then they have this charge
positive
These horizontal rows tell us the number of energy levels being filled by electrons
Period
Most of the mass of an atom is located here.
nucleus
Electrons weigh the same as the proton and the neutron T/F
False
What is the density of an object with the mass of 100g and the volume of 25cm3
4 g/cm3
When atoms take in electrons then they have this charge
negative