16. Some information on two atoms, whose symbols are W and X, are given below.Atom Electrons Protons Neutrons W 18 17 18x 17 17 20It can be deduced that D.A) W is a neguzive ion and X is a positive ion B) Wis heavier than X C W and X combine to fom a compound D) W and...
Protons and electrons both carry an electrical charge(电荷). The charges they carry are opposite to each other; protons carry a positive electrical charge while electrons carry a negative electrical charge. Neutrons carry no charge at all. Electricity is the movement of charged particles, usually ...
Matter is formed from atoms and nucleus, is composed of protons and neutrons and is surrounded by a cloud of electrons. Each proton carries a single positive (+ve) charge, and each electron carries a single negative (-ve) charge. The neutrons are neutral holding the nucleus together and ...
For example, there are three types of potassium atoms that occur naturally. All three types contain 19 protons and 19 electrons. 钾元素在自然界中有三种原子。三种原子都含有19个质子和19个电子。 However, one type of potassium atom contains 20 neutrons, another 21 neutrons, and still another 22 ...
It has six protons, six electrons, and six neutrons, so its atomic number is 6 and its relative atomic mass is 12. But there's also another form of carbon called carbon-14, with six protons, six electrons, and eight neutrons. It still has an atomic number of six, but its relative ...
Atoms and Their Atomic NumbersAll atoms have different numbers of protons,neutrons,and electrons.The protonsare positively charged and are in the nucleus.Neutrons are also in the nucleus.Butthey have no charge.And electrons orbit the nucleus.They have negative charges.The number of protons and ...
1 Atoms contain three different types of particle.These are electrons, neutrons and protons.(a) Which one of the three particles has a negative charge?(1)electron(s)(b) Which one of the three particles has the smallest mass?(1)electron(s)(c) Use words from the box to complete the ...
Protons and neutrons occupy the nucleus at the center of the atom. Electrons orbit the nucleus like planets around a star. They are grouped in layers called shells. WHAT MAKES ATOMS STICK TOGETHER? Electrons carry a negative electric charge, and protons carry a positive charge. The attraction...
Elements have different atomic masses - the number of protons plus neutrons increases up the table. Rows - elements of each row have the same number of energy levels (shells). Columns - elements have the same number of electrons in the outermost energy level or shell (one to eight). ...
Atomic structure A Lithium atom protons neutrons electrons An atom consists of a small central nucleus composed of protons and neutrons surrounded by electrons. An atom will always have the same number of electrons as protons. 2 Atomic and mass number The atomic number (or proton number) of an...