Periodic Table
Are elements arranged in INCREASING or DECREASING order of their atomic number?
INCREASING
If the atomic mass is 39 and the atomic number is 19. How many neutrons are present?
n= Atomic mass - atomic number
= 39 - 19
= 20
What subatomic particles are atoms made up of?
Protons, electrons, neutrons.
What is matter?
Anything that takes up space (mass and volume).
What are valance electrons?
Electrons in the outermost shell of an atom.
What is the MOST REACTIVE metal?
Francium
If the atomic mass is 1 and the atomic number is 1. How many neutrons are present?
0 neutrons
What subatomic particles are in the nucleus?
Protons and neutrons.
What's the difference between pure substances and mixtures?
Mixture: Different types of particles
Pure Substance: Same type of particle
What's the difference between a CATION and a ANION?
Cation: Positively charged ion formed when an atom loses 1+ electrons
Anion: Negetively charged ion formed when an atom gains 1+ electrons
Vertical columns of elements are called...
GROUP or FAMILY or elements
If the atomic mass of 17, 8 protons, 8 electrons, how many neutrons does the element have?
n= atomic mass - atomic number
= 17-8
= 9
What's the MAXIMUM number of electron in order to fill the 3rd shell?
8 electrons.
What's a homogeneous mixture?
A mixture that its appearance and properties are the same throughout.
If an element has valance 3 electrons, will it lose or gain electron(s) to obtain a full valance shell?
Lose 3 electrons ( takes less energy)
Locate Arsenic (As) by its group and period.
Group 15 and period 4.
If the atomic mass of SODIUM is 23 and atomic number is 11. What's the calculation for PEN?
P= 11
E=11
N= 23-11
= 12
How many valance electron(s) are present in Fluorine?
7 electrons.
Group of circles (connected together) represent a..
1. Atom 2. Molecule 3. Compound
2. Molecule
What's the net charge if an element gains 2 electrons?
2 -
Name 4 physical properties of all metals, and show where they are on the periodic table.
Metals are shiny, malleable, ductile and conductors of electricity. They are located left of the "staircase".
If Carbon has an atomic number of 6 and a mass of 12. How many neutrons does it have?
n= atomic mass - atomic number
= 12-6
= 6
What happens to the energy of an electron as it moves into higher energy levels.
Its energy increases (it must absorb energy).
What are 4 common ways to seperate mixtures by physical means?
Filtration, Evaporation, Magnetic attraction, Distillation
How many electrons does oxygen have if it gains 2 electrons?
8+2
= 10