Periodic Table
What number tells you the number of protons in an atom?
Atomic Number
What particle has a positive charge?
Proton
What is the name of the element with atomic number 1?
Hydrogen
How can you determine the number of valence electrons?
How do you figure out the number of electrons in neutral atom?
It's the same as the number of protons (atomic number)
What particle has a negative charge?
Electron
What element has an atomic mass of 238.
U, Uranium
How many valence electrons are in group 1?
1
What particle has no charge?
Neutron
How many valence electrons are in group 14?
4
What is an isotope?
An atom of the same element with a different number of neutrons
Which particle/s is/are in the nucleus?
Proton and neutron
Which element has 42 protons?
Mo, Molybdenum
What element has 77 electrons when neutral?
Iridium
How many valence electrons does Strontium (Sr) have?
2
What does the term 'valence electrons' mean and why are they important?
number of electrons on outermost shell, tells how reactive an element is
What subatomic particle reacts with other atoms
Electrons
How many neutrons does Argon (Ar) have?
22
What element is a solid named after a state with 253 neutrons?
Californium
How many electrons does Iodine (I) have?
7