Atoms & Periodic Table

Neutrons are neutral. This means that

• neutrons are not involved in chemical reactions.

• neutrons do not have mass.

• neutrons are neither acidic nor basic.

• neutrons do not have a charge.

The overall charge of the nucleus is

• sometimes positive and sometimes negative.

• negative.

• neutral.

• positive.

Which of the following statements is true about the lithium and the helium atoms?

• Lithium is much smaller than helium.

• There is no difference between helium and lithium.

• Lithium has more protons, neutrons, and electrons.

• Helium has more protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

Julius learns that adding protons to the nucleus of an atom changes its atomic number. Which of the following always occurs when the atomic number of an atom changes?

• The properties of the atom stay the same.

• The color of the atom changes.

• The element represented by the atom changes.

• The atomic mass of the atom stays the same.

The nucleus of an atom consists of

• neutrons and electrons.

• protons and electrons.

• neutrons alone.

• protons and neutrons.

Which element on the periodic table contains 11 protons?

• boron

• sodium

• copper

• aluminum

The _______ of an atom are negatively charged.

• electrons

• negatrons

• neutrons

• protons

Which part of an atom determines how it will react with other atoms?

• neutrons in the nucleus

• innermost electrons

• valence electrons

• protons in the nucleus

Which of the following statements is true?

• Individual atoms can be seen with the naked eye.

• The nucleus of an atom contains protons and neutrons.

• Protons are located outside the nucleus of an atom.

• Electrons do not have mass.

Ryan wants to identify an element. Which piece of information would best help Ryan identify the element?

• how many protons the element has

• how many electrons the element has

• what charge the element has

• how many neutrons the element has