Chemistry, 18.02.2021 09:20 gracetay6873
What is an atomic number? An atomic mass?
Give the number of protons, electrons and neutrons in one atom of Carbon.
What are groups on the periodic table? How many are there?
What is significant about elements in a group?
What are periods on the periodic table? How many are there?
When are atoms considered to be stable?
Looking at the Periodic Table, how can you determine if an element is a metal, metalloid or nonmetal?
What state of matter are most metals when at room temperature?
What group are the alkali metals? Why are they never found uncombined in nature?
How many valence electrons do alkaline earth metals have?
Where are the transition metals located on the periodic table?
What are metalloids? Where are they located on the periodic table?
What group are the halogens? How many valence electrons do the halogens have? Explain why the halogens are so reactive.
What group are the noble gases? Why are they considered inactive?
Answers: 1
Chemistry, 21.06.2019 17:00
What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?
Answers: 2
Chemistry, 21.06.2019 18:00
Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /
Answers: 1
Chemistry, 22.06.2019 01:00
Which of the following is not a true statement about dwarf planets? a the kuiper belt contains comets, asteroids, and dwarf planets. b ceres is a dwarf planet located in the kuiper belt. c the largest known dwarf planet in the solar system is named eris.
Answers: 2
Chemistry, 22.06.2019 09:10
Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons
Answers: 3
What is an atomic number? An atomic mass?
Give the number of protons, electrons and neutrons in one...
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