Properties of the Periodic Table
This primary characteristic describes nonmetals as hard, but capable of being snapped in half.
What is generally brittle solids?
As you move down a group on the periodic table, atomic radius correctly shows this trend due to additional electron shells.
What is it increases?
If a coffee maker has a power rating of 900 watts and is operated for 2.5 hours, it uses this much energy in watt-hours.
E=900 W×2.5 h=2250 Wh
An oven element using 300,000 J of energy in 200 seconds has this power in watts.
P=300,000 J/200 s=1500 W
This type of radioactive decay involves the emission of a helium nucleus.
What is alpha decay?
Elements in Group 18 are generally unreactive because they possess this in their outer electron shell.
What is a full outer electron shell?
This determines the number of valence electrons for elements in Group 2.
What is their group number?
An electric kettle using 1500 watts for 0.05 hours would cost this much at $0.15 per kWh.
A hairdryer with a current of 15 A and a resistance of 8 Ω has this voltage.
V=15 A×8Ω=120 V
This process involves the fusion of lighter atomic nuclei to form heavier ones, typically occurring in stars, with helium as a primary product.
What is the alpha process (or nuclear fusion)?
Moving across a period from left to right, atomic radius generally decreases due to an increase in this.
What is effective nuclear charge?
Elements in the same group on the periodic table typically share this characteristic regarding their chemical behavior.
What are similar chemical properties?
If a toy car motor expends 0.5 W of power from a 3 V battery, this amount of current is supplying the motor.
I=0.5 W/3 V≈0.167 A
If a fan is rated at a current of 1.5 amps and a voltage of 120 volts, this is its power rating.
What is 180 Watts?
This term describes a property like mass.
What is an extensive property?
This highly reactive family of elements, found in Group 17, tends to gain one electron.
What are halogens?
Across a period, from left to right, the reactivity of metals generally shows t
What is it decreases?
An LED light using 8 W of power with a supplied current of 0.06 A requires this many volts to run.
V=8 W/0.06 A≈133.33 V
An electric oven with a power of 1000 watts and a voltage of 110 volts draws this current.
What is 9.09 A?
For the isotope 1940K, what is its atomic number, how many protons does it have, and how many electrons does it have in a neutral atom?
19 protons, 21 neutrons, 19 electrons
Elements in Group 13 typically have this many valence electrons.
What is three valence electrons?
What two opposing factors primarily influence the overall trend of atomic radius on the periodic table, and how does each factor affect the size?
number of protons and number of electron rings/energy levels/electron shells.
A flashlight battery with a current of 0.5 A, operating for 10 hours at 3 V, uses this much energy.
When 100 volts is applied to a 20-ohm resistive circuit, this is the current flowing through it.
What is 5 A?
This concept explains the time it takes for half of a radioactive isotope to decay.
What is half-life?