Atomic Structure and Periodic Table Redo

Although atoms can't be seen they can be measured. Which subatomic particles are primarily responsible for giving an atom its mass?

• protons only

• protons and neutrons

• neutrons only

• protons and electrons

Electrons, protons and neutrons have mass. What mass does electrons have in comparison to the proton?

• same size

• bigger than the proton

• smaller than the proton

• electrons don't have mass

Helium rarely ever combines with an other element. Chemists have put it on the periodic table in the same column as

• alkaline earth metals

• halogens

• noble gases

• alkali metals

Hydrogen has been placed in the first column of the periodic table. It is in the group because it is very reactive. It is very reactive like the other elements because it has an outermost shell with

• three valence electrons

• two valence electrons

• one valence electron

• eight valence electron

Based on the information, what is the atomic number of this element?

Tags

NGSS.MS-PS1-1

What is the atomic mass of this element?

Tags

NGSS.MS-PS1-1

• W

• X

• Y

• Z

Tags

NGSS.MS-PS1-1

• Group 2

• Group 8

• Group 12

• Group 18

Atoms of which two elements have a COMBINED total of 23 protons?

• Sodium Na and Magnesium, Mg

• Boron, B, and Carbon, C

• Copper, Cu, and Zinc, Zn

• None of these

How many valence electrons are in an atom of each element in Group 15 in the periodic table?